Big Diamonds to be Found at the Crater of Diamonds State Park

3.85 Diamond Found at Crater of Diamond State Park
It has been a productive year at the Crater of Diamonds State Park. To date, October 26th, 2013, nearly 400 diamonds have been found over the span of the year, with some rather large ones, several over 2 carats. For instance, Oklahoma teen Tana Clymer found a beautifully formed 3.85-carat canary diamond on October 19th, very similar to the fine diamond that was found by the late Marvin Culver, also of Oklahoma, in 2006. That diamond, the 4.21 carat “Okie Dokie Diamond” has been featured in several books, magazines and has been on display to the public a few times. Another large diamond, a 5.16 carat diamond was found by 12-year-old Michael Dettlaff of North Carolina in August. A 2 carat brown stone was found in June and all of these stones have one thing in common…

Many of these large diamonds are often found on the surface of the digging area.

One of the things many people are shocked to see upon arriving at the park is the actual mine area. It looks like a freshly plowed dirt field, waiting to be seeded and farmed. This area is poked and prodded, pitted and flipped, in search of the small gems distributed in the dirt.
Digging for Diamonds at the Crater of Diamonds State Park Field

Finding the park is very easy, once you are in the general area of Murfreesboro, Arkansas you will see signs pointing to the famous state park. You pay a nominal fee per person and go out into the field to search. You can dig, collect dirt and screen it, looking through the mud for a glassy pebble.
Digging for Diamonds at the Crater of Diamonds State Park

Or, you can do what many of the people who find the large diamonds do, simply walk around the dirt field, looking for crystals that have risen to the surface.
Digging for Diamonds at the Crater of Diamonds State Park

Either way, the Crater of Diamonds State Park is a great place to visit and try your luck at finding a precious stone. The chance of finding one of these stones is stacked against you, but if you happen across one of those rare 2+ carat stones, the Associated Press would like to acquire your photo posing with the stone.

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Rock Hounding for Agates in SouthWest Texas

Rock Hounding West Texas for Agate and many other great finds
By Erin Balzrette
for Katy Rock Shop
http://www.katyrockshop.com

Agate from South-Western Texas

Above: Banded Agate from the Alpine Texas area

After rock hounding in Texas with a guide as amazing as Frank Roberts of Austin, Texas, Dawn and I felt ready to go it alone. Also, we begged Frank to come if we got lost or could not identify what we were seeing, and he emailed us all weekend to be sure we were safe. Like I said, we “went it alone”, with Frank on stand-by. We grabbed a copy of The Gem Trails of Texas by Brad Lee Cross and decided to head out.

Agate from South-Western Texas

Above: Classic Agate from the Alpine Texas area

I called Paul at Moonlight Gemstone, of Marfa, TX, (432-729-4526) Bruce Huff, of Katy Rock Shop has a great respect for his beautiful work as do I, and I could not wait to see it for myself, and meet him. The Marfa agate is breathtaking. Paul Graybeal has exclusive rights to the private property in which most of Marfa agate is found. He explained that access to for us to do some hounding would not be possible. He keeps names or locations of land owners who place trust in him to protect their land from sought after agate to himself. It is easy to see why he protects the agate he does. It should be protected, and the land owners have the right to feel their trust has been in no way misplaced. Instead, he invited us to come see him work! This was an incredible offer that I was not about to miss! Paul is thoughtful, generous, patient and kind. I was as impressed by the man, as I was by the work he did, and the agate that surrounded us. Spending the afternoon watching him work, letting us work with him, learn from him, was and experience I will not forget.

Agate from Western Texas

Above: FIRE AGATE from the Alpine Texas area

We couldn’t wait to get to Woodward Ranch (WoodwardRanch.com) famous for the beautiful red plume agate only found there. There is so much more to find at the ranch! The Labradorite is a clear yellow! Opals that are gorgeous, and what she calls “yard art” is some of the most beautiful I have seen. (Yard art … no charge!) $6.00 a person, you are given a detailed map, a quick learner’s course, and shoos you before it gets too hot! When you return she counts it out, $6.00 a lb. for agate. We each left paying 18 dollars, 2 lbs. of agate, and many more lbs. of “yard art” so beautiful I am thrilled to have found it. A few items I collected from this trip are on my website. She was a delightful woman who spoke of her late husband Trey in a way that made you want to sit all day and talk to her. I, like so many others, are so grateful that Woodward Ranch is still operating and allowing others to see the wonder it has to offer.

Terri Smith of Alpine, TX, emailed to explain that she will set up Agate “Hunts” for you, a group, or family, in the fall. THE FALL when it’s….cooler? Terri is the logical one here. And so we will go back in the fall and go to the Ranches able to be hounded at that time on the tours given. The email was very nice and suggested that we try the book I had bought for the journey. I was grateful for the advice, and that I had picked the right book! I have heard only great things about Terri and her extensive knowledge of the area and experience.

“The Gem Trails of Texas Book” by Brad Lee Cross, was for our purposes to the mile, correct and accurate in its description of findings, and location. We found beautiful Jasper at the picnic table Jasper sight 8 miles from Marathon. Exactly as the book said. Amazon is one seller that carries the Gem Trails Series.

Agate from South-Western Texas

Above: Iron Rich Agate Geode from the Alpine Texas area

The West Texas Agate was a trip we will never forget, filled with beautiful surprises showing in each piece you see from that area. While visiting the Katy Rock Shop, you will see pieces from all over Needle Peak, Woodward, Marfa, and so much more and it is all there waiting to show you the beauty of West Texas.

Please find links to Katy Rock Shop, Terri Smith, Moonlight Gemstone, Woodward Ranch, Frank Roberts, and more at my website www.treeclimbersjewelry.com. Pieces I collected during this trip are displayed on the site as well.

Agate from South-Western Texas

Above: Iron Rich Carnelian Agate from the Alpine Texas area

Here at WhereToFindRocks.com we love using Hotels.com to find places to stay while out rockhounding!
And you never know when that hole in the ground is going to require working after hours on, so with Hotels.com,
No hotels.com Change or Cancel fees on lodging bookings!
So, find a hotel around Marfa, Texas or Alpine Texas and get out and collect some Agates!

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Collecting Tourmaline in Colorado – Brown Derby #1 Field Trip

The Brown Derby #1 Pegmatite, Gunnison County, Colorado- An unusual LCT-Type Pegmatite with Rubellite Tourmaline, Lepidolite and Rare Earth Element Species
Philip M. Persson
3139 Larimer St., Denver, CO, 80205
perssonrareminerals.com
Exploration Geologist

When it comes to Colorado pegmatite’s, most people think of the vivid and prolific smoky quartz and ‘Amazonite’ feldspar combinations or perhaps fluorite or topaz crystals from the Pike’s Peak batholith, which can be seen in collections all over the world. Tourmaline is certainly not a species that comes to most collector’s mind’s from the Rocky Mountains, yet Colorado does contain several unusual and interesting pegmatite’s of the ‘LCT’ (lithium-tantalim-Niobium) type which contain fairly high-quality (though not ‘gem’ in the pocket sense) tourmaline crystals along with other rarer species. The most notable and certainly the most studied of these deposits is the Brown Derby #1 Pegmatite, located in the Ohio City/Quartz Creek District, approximately 18 miles northeast of Gunnison in the high mountains of Central Colorado. First mentioned by Eckel (1933) and later by Staatz and Trites (1955) in their exhaustive study on the Quartz Creek Pegmatite District, this locality has long been of interest to both collectors and mineralogists. In recent years, however, due to a combination of property access issues, remoteness, and a shift in focus of Colorado collecting to ‘dig’ localities for smoky quartz, amazonite et cetera, the Brown Derby seems all but forgotten. This article is not an attempt to eclipse or duplicate the already extensive literature on this locality, but rather provide a modern and collector-oriented perspective on this fascinating deposit.

Quartz Creek Pegmatite District

Gunnison Colorado, where the Quartz Creek Pegmatite District is located


Quartz Creek Pegmatite District

Close up of the Quartz Creek Pegmatite District


Figure 1: Map showing location of Gunnison in Central Colorado (‘A’), with inset from Hanley et al. (1950) showing the Quartz Creek Pegmatite District, with the Brown Derby #1 Deposit marked with red star.

The Brown Derby #1 Pegmatite is the largest and most mineralogically-complex of a group of over 5 semi-parallel, dike-like pegmatite bodies which are situated on the western slope of a fairly prominent ~9400 foot high hill above the small settlement of Ohio City, approximately 18 miles northeast of Gunnison, Colorado, and 180 airline miles southwest of Denver. (Staatz & Trites 1955). According to Cerny (1991)’s pegmatite classification scheme, these are classic ‘LCT’ (lithium-tantalum-niobium) type deposits, and contain the geochemical and mineralogical characteristics of such deposits. They intrude ~1.7 billion year old metadiorite and associated metamorphic rocks of the Idaho Springs group, the Precambrian basement complex which covers a large portion of the State. Geochronology work by Heinrich (1967) and others found the pegmatite’s to be syngenetic to metamorphosis of the host rocks ~1.7 billion years ago, and they intruded as large sheet-like bodies parallel to the internal foliation and structure of the host rock. They strike N/NE and dip gently into the steep southeast hillside at 20-35 degrees (Heinrich 1967). The largest 3 pegmatite’s of the Brown Derby group all display exceptional mineralogical and geochemical zoning which is typical of most large LCT-type deposits, with the #1 Dike exhibiting the highest mineral diversity.

along the strike of the Brown Derby #1 Pegmatite
Figure 2: Looking Southeast along the strike of the Brown Derby #1 Pegmatite; large metal grate visible in center of photo is covering one of the underground drifts leading to a large stope on the core of the deposit. (Photo copyright Rudy Bolona/mindat.org)

Entrance to the #2 Tunnel, or main adit of the Brown Derby #1 Pegmatite
Figure 3: The Entrance to the #2 Tunnel, or main adit of the Brown Derby #1 Pegmatite, showing the sharp contact between pegmatite (white rock) and overlying metadiorite (dark gray) at the hanging wall contact. (Photo copyright Rudy Bolona/mindat.org)

The #1 Pegmatite was developed from the early 1930’s through the 1970’s and was mined principally for the lithium content of lepidolite, along ceramic-grade feldspar, minor beryl, and a somewhat substantial production of microlite, a tantlum species, though it is unclear if the resulting microlite concentrate was ever processed (Heinrich, 1967). It is presently divided into two properties in legal terms; a large surface exposure with associated dumps, which sit on National Forest/BLM land and are open to mineral collecting, and a fairly small underground portion which is owned by a group which identifies themselves as ‘Precious Offerings Mineral Exchange, LLC’ and is based in Boulder, Colorado. They are involved in Bureau of Mines-mandated remediation work on the underground workings of the Brown Derby #1 Mine, and as their willingness to allow collectors underground is not presently known. The author does not want to encourage activity which may compromise their remediation efforts; therefore this article will focus on specimens and species which can be collected from surface dumps and exposures, of which there are many. Hopefully in the future, the owners of the underground mineral rights will allow collectors to participate in their efforts to recover specimens from this unusual deposit.

The Brown Derby Mine is best approached from U.S Highway 50 from a small turnoff approximately 6 miles east of the small settlement of Parlin and 17 miles east of Gunnison. Turn north here onto Forest Service road 802, also locally marked as the 44 Road. From here, continue north ~1.5 miles, bearing right at the ‘Y’ onto 802 north where some small granitic-looking outcrops start to become visible on your right. Continue on this fairly good dirt road north/northeast past a small stream crossing (may not be passable to passenger cars after recent rain or in the spring) and ~1 mile after the stream crossing, bear left at another fork up an obvious large ‘humpback’ like sagebrush-covered hill, passing a cattle fence (please respect local ranchers and close gate after your drive through!). Continue on this steepening road for another ~1.5 miles over somewhat rough terrain (4 wheel drive/AWD necessary, though high clearance is not mandatory for this section) until you reach a large flat ridgeline with small aspen trees in a grove on your left. This is a good camping spot. Continue until the road apparently disappears into the sage rush, then pick up another fairly good dirt road leading steeply downhill to the left/west towards now fairly obvious white pegmatite mine dumps below you. Continue down past several switchbacks to an eventual right turn through an open gate to a mine access road leading past an abandoned shack where core samples were stored/examined. The large dumps below you and the large gated adit to your right are the Brown Derby #1 Mine.
Tourmaline: Tourmaline is found in an impressive range of colors and several species at the Brown Derby #1 Mine. Of primary interest to collectors are large crystals and sprays of Elbaite variety Rubellite, which ranges from a dull whiteish-yellow color to choice ‘hot pink’ crystals reminiscent of Transbaikal, Russia or Stewart Mine, California rubellite crystals in color. While generally not gemmy, rare crystals to several cm. are found frozen in lepidolite and cleavelandite matrix, which do show gemmy, clear sections that could potentially yield small gems. An early 1970’s Denver Post article reported gem-quality elbaite in small amounts from the Brown Derby Mine (Eckels 1997), but the author has not seen any of this material in collections or institutions. Most impressive and aesthetic are radiating ‘sprays’ of parallel to sub-parallel pink Rubellite crystals set in coarse purple lepidolite matrix, with individual rubellite crystals up to 15 cm. or more in length. Early reports indicate that in several ‘pods’ in the core of the pegmatite, ‘logs’ of elbaite tourmaine crystals up to 30 cm. long showing ‘watermelon’ zoning with rubellite surrounding an elbaite core were found. The author has personally seen well-formed crystals up to 20 x 5 cm. in place. Also interesting are elbaite crystals which are either partially or fully psuedomorphed by lepidolite or muscovite, which are locally common. Large masses of tightly intergrowth elbaite crystals showing an amazing color gradation from lime-green to yellow to pink to reddish within a single crystal were also found fairly commonly (Staatz & Trites 1955). Staatz et al. (1955) looked at the geochemical variations within these crystals as a guide to color and color gradation, as well at petrogenesis of the pegmatite as a whole. Schorl is also found fairly abundantly at the Brown Derby #1 Mine, where it occurs in the wallzone and outer intermediate zones of the pegmatite, generally in subhedral to poor crystals, sometime radiating outward into the metadiorite.

Rubellite tourmaline crystals in quartz
Figure 4: 4 cm. long, slightly gemmy hot-pink Rubellite tourmaline crystals in quartz with partial rubellite crystals surrounding it, Brown Derby #1 Pegmatite.

‘curved’ Rubellite tourmaline crystal in Cleavelandite
Figure 5: Naturally ‘curved’ Rubellite tourmaline crystal in Cleavelandite and lepidolite. Curvature resulted from tectonic movement in pegmatite during crystallization. Scale in cm.

radiating pink Rubellite crystals to ~5 cm
Figure 6: Spray of radiating pink Rubellite crystals to ~5 cm. in fine-grained lepidolite and quartz, similar to Stewart Mine, California material. ~15 cm. field of view.

‘polychrome’ tourmaline
Figure 7: Good example of massive to coarsely-crystalline ‘polychrome’ tourmaline with gradation from pink to green to yellow, showing some translucent to slightly gemmy sections. Field of View 15 cm. across.

Lepidolite: Second after tourmaline in interest to collectors, and arguably more famous from the Brown Derby Mine is Lepidolite, the violet-colored lithium mica, which occurs here as ‘books’ and crystals to over 10” across! Books of lepidolite several inches across are common, and even 6” crystals are not unusual. Masses of nearly solid lepidolite 5-10 feet across can be observed in places in the pegmatite. Lepidolite along with other mica’s at the Brown Derby Mine were studied by Heinrich (1967), who also noted muscovite, zinnwaldite, and polylithionite, though the occurrence of the latter is questionable. In addition to the large tabular hexagonal ‘books’, lepidolite also occurs as large masses of fine-grained, equigranular crystals to several mm., which generally host more unusual species such as microlite or monazite. Finally, an unusual variety known as ‘ball lepidolite’ occurs locally in hemispherical masses up to 15 cm. composed of rounded, subparellel crystals, which supposedly have been worked into cabachons and other lapidary items. All lepidolite from the Brown Derby #1 Mine shows a handsome rich purple color and a generally bright luster.

Lepidolite to 15 cm
Figure 8: Large books of Lepidolite to 15 cm. across in quartz-cleavelandite pegmatite, hand for scale.

Monazite-(Sm): In addition to fairly common mineral like elbaite and lepidolite, the Brown Derby #1 Mine is also unusual in it’s concentration of more unusual rare earth element (REE) species. Arguably the most interesting of these is the recent discovery of Monazite-(Sm), though the possibility of this species at the Brown Derby Was first noted over 50 years earlier by the always astute E.M Heinrich (1960), who analyzed several monazite samples from the Brown Derby #1 Mine containing >10% Samarium(!) Colorado field collector and REE specialist Rudy Bolona collected several specimens of brownish-red massive Monazite associated with white Cleavelandite feldspar and lepidolite from a single boulder on the dumps in 2009, and subsequently has a sample sent to Dr. George B. Morgan at the University of Oklahoma, who analyzed it to be the very rare species Monazite-(Sm), found only at 3 other localities worldwide. While all monazite samples from the Brown Derby #1 Mine analyzed by Heinrich (1960) appear to contain enough Sm to qualify as Monazite-(Sm), Monazite-(Ce) also occurs at this deposit, so it is not safe to assume that all monazite collected at the Brown Derby #1 is Monazite-(Sm). Monazite-(Sm) occurs at the Brown Derby #1 Pegmatite as subhedral masses to crude crystals up to ~6.5 cm. across, typically embedded in fine-grained lepidolite with cleavelandite feldspar and quartz. The Brown Derby #1 occurrence may represent the best locality in the world for this rare species, and new finds of this rare mineral are possible on the extensive dumps.

Monazite-(Sm)
Figure 9: Massive reddish-brown Monazite-(Sm) (analyzed) with purple lepidolite, 6.8 cm. across. (Photo copyright Rudy Bolona/mindat.org)

Pollucite: The Brown Derby #1 Pegmatite represents the only Colorado locality for this rare cesium species, which occurs as two large, ~30 cm. wide massive pods in the central core zone of the pegmatite, along with large crude crystals of opaque topaz, cleavelandite, and quartz (personal communication with Rudy Bolona, September 2009). No crystallized material is known, nor has this mineral been reported from the dumps.

Massive white crystalline Pollucite
Figure 10: Massive white crystalline Pollucite, 6.5 cm. across. (Photo copyright Rudy Bolona/mindat.org)

Stibiotantalite: Stibiotantalite is a rare Antimony Tantalum Niobium Oxide species found in LCT-type pegmatite’s and was first described from the Brown Derby #1 Pegmatite by Heinrich & Giardini in 1957. It occurs as subhedral to poorly euhedral crystals generally 1-2 cm. but rarely up to 5 cm. associated with the secondary Tantalum species Rynersonite as a white to cream surface alteration of the stibiotantalite. Heinrich & Giardini found stibiotantalite on a large boulder on the dumps of the #1 Pegmatite, and thought that possibly all the stibiotantalite in the #1 pegmatite was contained in this single block, a large mass of cleavelandite, topaz and lepidolite from the core margin core. However, recent finds of small Stibiotantalite crystals by Colorado collectors on the dumps would argue otherwise.

Well-formed 8 mm. long Stibiotantalite
Figure 11: Well-formed 8 mm. long Stibiotantalite crystal on lepidolite-cleavelandite pegmatite, collected recently on the dumps. (Photo copyright Rudy Bolona/mindat.org)

Columbite-(Fe): Columbite-(Fe), the Fe-analogue of the Niobium oxide species Columbite, is found in several assemblages at the Brown Derby #1 Pegmatite. In the core margin zone of the pegmatite, it is found with Cleavelandite feldspar, quartz, and mica minerals as large, crudely euhedral crystals to 10 cm. In the border zone of the pegmatite, especially towards the hanging wall contact with the metadiorite, it is found as small (<5 cm.) grains and crude crystals associated with reddish albite/perthite, Euxenite-(Y), and Monazite-(Ce). Nowhere at the Brown Derby deposit is Columbite-(Fe) an especially common nor conspicuous constituent, however it does occur through a wide portion of the pegmatite. Columbite-(Fe) in albite
Figure 12: Partial crude crystal of Columbite-(Fe) in albite, 8 x 6 cm. (Photo copyright Dean Allum/mindat.org)

Euxenite-(Y): A glassy green metamict Rare Earth species, previously identified as Betafite in some literature, is now believed to be Euxenite-(Y) (Heinrich 1967). Euxenite-(Y) is restricted in occurrence at the Brown Derby pegmatite to a core-margin albite replacement near the upper north margin of the core, but may exist in other unrecognized or mined-out zones as well. It occurs here as metamict masses to 4 cm. in weathered red albite with schorl and columbite-(Fe), and is highly radioactive.

Monazite-(Ce): Monazite-(Ce) occurs at the Brown Derby #1 pegmatite in several assemblages, making non-quantitative distinguishing from Monazite-(Sm) difficult to impossible. It is found as fairly sharp euhedral crystals to ~2.5 cm. in red albite with columbite-(Fe), probably from an analogous assemblage to the aforementioned Euxenite-(Y) zone. The Harvard University Mineralogical museum has several excellent crystallized specimens, one of which (HMM #104814) is pictured here.

Monazite-(Ce) to 2.4 cm. in perthite-albite-biotite pegmatite, Harvard Mineralogical Museum
Figure 13: Well-formed crystals of Monazite-(Ce) to 2.4 cm. in perthite-albite-biotite pegmatite, Harvard Mineralogical Museum #104814.

Microlite: Microlite, the complex tantalum oxide species, is known from several zones of the Brown Derby #1 Pegmatite and was one of the significant economic minerals of this deposit, though the present distribution of microlite in the dumps and in-situ would suggest otherwise. This is probably due to the fact that microlite occurred in concentrated ‘shoots’ or elongated pods in fine-grained lepidolite-quartz-cleavelandite pegmatite, a mode of occurrence similar to that at the famous Harding Pegmatite in New Mexico. These ‘shoots’ were mined selectively for their microlite content, and ~1200 pounds of Microlite was concentrated and stockpiled for processing, though it is unclear if this material was ever actually sold (Hanley 1950). Hanley also estimates that ~9,000 lbs. of microlite remained at the time of his study in 1944 at the Brown Derby #1, though it is unclear how much of that has been mined since. Mineralogically, microlite forms small crude to somewhat euhedral octahedral crystals to 1 cm. with a resinous brown to black luster and distinctive radiation ‘burn halo’s’ in the surrounding lepidolite. These crystals are often quite radioactive and may in fact be uranomicrolite.

Microlite in crude 3-4 mm. crystals in fine-grained purple Lepidolite
Figure 14: Microlite in crude 3-4 mm. crystals in fine-grained purple Lepidolite; specimen 4 cm. across. (Photo copyright John Betts/mindat.org)

Other accessory species: For the sake of brevity as well as the fact that they do not occur in ‘collector-quality’ crystals, other species such as Topaz, Beryl, Garnet, and Bismutite will not be discussed in detail here. Suffice it to say that they are present at the Brown Derby #1 Pegmatite, and a quick search of the already extensive literature on this deposit will yield many interesting references.

In closing, the Brown Derby #1 Pegmatite remains one of the more interesting and unusual pegmatite deposits in Colorado, and unlike many similar localities, a large portion of the dumps as well as surrounding prospects remain both on public land as well being as accessible to vehicles. The Brown Derby #1 deposit is also unusual in that while it continues to yield excellent, aesthetic specimens of relatively common minerals such as Rubellite tourmaline and lepidolite, finds of extremely rare species such as Monazite-(Sm) have also been made recently. If you plan to visit from Brown Derby #1 Pegmatite, please be respectful of local claim holders and property owners and exercise safety and common sense around the large dumps and potentially dangerous mine faces and outcrops. With persistence and luck, this locality should continue to yield great mineral specimens for many years to come.

References
1.) ‘Mica’s of the Brown Derby Pegmatites, Gunnison County, Colorado’, Heinrich, E.M, The American Mineralogist, Volume 52, July-August 1962.
2.) ‘A New Lepidolite Deposit in Colorado’, Eckel, F.B., American Scientific Society, 16, pp. 239-245.
3.) ‘Lithia Pegmatites of the Brown Derby Mine, Gunnison County Colorado’, Hanley, John B., 1946, American Mineralogist 31, 147.
4.) ‘Pegmatite Investigations in Colorado, Wyoming and Utah: 1942-1944’, E.M Heinrich et al., USGS Professional Paper Paper 227, 1950.
5.) ‘Stibiotantalite from the Brown Derby #1 Pegmatite, Colorado’, Heinrich, E.M & Giardini, A.A., American Mineralogist 45, pp. 728-731, 1960.
6.) ‘The Quartz Creek Pegmatite District, Gunnison County, Colorado’, Staatz, M.H. & Trites, A.F., USGS Professional Paper 265, 1955.
7.) ‘Paragenesis of the Topaz-Bearing Portion of the Brown Derby #1 Pegmatite, Gunnison County Colorado’, Rosenberg, P.E., American Mineralogist 57, 571-583, 1972.
8.) Mindat.org, accessed 8-01-2013 to 8-15-2013.

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