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{"id":577,"date":"2014-04-29T10:29:12","date_gmt":"2014-04-29T10:29:12","guid":{"rendered":"http:\/\/wheretofindrocks.com\/?p=577"},"modified":"2018-07-17T07:53:28","modified_gmt":"2018-07-17T07:53:28","slug":"field-trip-midwestern-geode-localities","status":"publish","type":"post","link":"http:\/\/wheretofindrocks.com\/field-trip-midwestern-geode-localities\/","title":{"rendered":"Field Trip: Midwestern Geode Localities"},"content":{"rendered":"


\nBy: Jeremy Zolan<\/p>\n

Difficulty Level: Easy to Medium<\/p>\n

Supplies Needed:
\nSafety Goggles
\nWater
\nInsect Repellant
\nShovel
\nCrack Hammer and Chisel
\nPaper for Wrapping Specimens
\nBucket
\nPrybar (Optional)
\nPick Axe (Optional)
\nWheeler-Rex 590 Soil Pipe Cutter (Optional)<\/p>\n

Search for Minerals from Iowa
\n<\/a><\/p>\n

Description:<\/p>\n

View a map of the locations of these geodes by visiting MinDat.org’s copy of this map
\nClick Here to Load Map<\/a>
\nGeodes in the Warsaw formation of Iowa, Missouri, and Illinois. Each ‘x’ is a geode location. Originally from Arthur E. Smith (1997): Geodes from the Warsaw Formation of Missouri, Iowa, and Illinois, Rocks & Minerals, 72:6, 420-423. Updated and colorized by William W. Besse.<\/p>\n

Many sites in the tri-state area of southeast Iowa, northeast Missouri and western Illinois produce geodes of world class quality. In fact, nowhere else in the world is richer in geodes than this strange area of the Midwest, where the Mississippian geode bearing Warsaw limestone formation is exposed near the surface. The geodes can reach 20cm across or larger and are mostly lined with quartz crystals though a variety of minerals like calcite, dolomite, sphalerite, and even millerite have been found in geodes. Geodes can be found wherever the Warsaw formation can be found outcropping. They can also be dug from riverbanks. Many fee dig sites for geodes are found in the areas of Iowa, Missouri, and Illinois rich in geodes.<\/p>\n

\"wheelerrex-590-lg\"<\/p>\n

A pipe cutter, specifically the model above (Wheeler-Rex 590 Soil Pipe Cutter) is great for opening geodes. Simply score the geode around the perimeter lightly with a hammer and chisel, clamp the cutter around the perimeter of the geode, and then carefully apply pressure until the geode splits. It is most desirable to split geodes into two equal sized hemispheres.<\/p>\n

\"quartzgeodeiowa\"
\nLarge quartz geode from Keokuk area- 20 cm diameter. Collected by David Wixom. K. Nash specimen and photo.<\/p>\n

\"dolomiteiowageode\"
\nTypical geode and associated minerals (calcite and dolomite) from Keokuk, Iowa area. 4cm x 4cm. Rolf Lutcke specimen and photo. Ex. Paul Griswold<\/p>\n

\"Rhodochrosite<\/a>

Geodes sometimes have carbonate minerals inside, like Calcite. But, wouldn’t it be cooler if they had crazy red Rhodochrosite crystals like this. Click here to see more amazing photos of crystals<\/p><\/div>\n

Localities:<\/p>\n

Sheffler Rock Shop and Geode Mine:
\nRR1 Box 171
\nAlexandria, MO 63430
\nAt junction of Highway 61 and 27, 6mi S of Alexandria<\/p>\n

Tim Sheffler
\n(660) 754 – 1134
\ntsheffler@mchsi.com
\n$25 per day for 50 lbs of material. 75 cents for each additional pound<\/p>\n

\"blackiowageodes\"
\nCalcite and quartz geode from the Sheffler Geode Mine. A good specimen for the locality. 10 cm wide. Roger Sedgwick specimen and photo. Collected by owner.<\/p>\n

Geodes are very abundant at this locality, hence the high limit for material. They are typically filled with quartz crystals but some other interesting mineralization can be observed. Dolomite, calcite, and pyrite are common accessories. It is best to use a prybar to free the geodes from the limestone matrix and open them at home or wherever they can be carefully cleaned, opened, and sorted.<\/p>\n

Des Moines River, Iowa and Missouri<\/p>\n

Geodes can be found abundantly in the outcrops on the shores of the Des Moines river. Bring a shovel to loosen geodes from the muddy banks and wash them in the river so the surface features can be seen. Some rocks at these riverbank localities may be deceiving and look like geodes but are just cobbles that have been well-rounded by erosion. These geodes can be filled with a wide variety of minerals and be of extremely varying but most will only contain quartz and typically at most one other species such as calcite or dolomite.<\/p>\n

Jacobs’ Geode Shop and Mine:
\n823 East County Rd 1220
\nHamilton, IL 62341
\n(217) 847-3509<\/p>\n

\"iowacollecting\"
\nCaption: Collector with large pile of geodes in Jacobs’ Geode Mine workings. E. Harrington photo.<\/p>\n

Call before visiting. It is best to dig while the owners are around so they can show you the best technique to use at this site. It\u2019s a good idea to call in advance to make sure they will be at the mine. The all day fee is reported to be $20. Apparently the owners only allow visitors to crack certain geodes on site so most of the prep work should be done at home. Reported to produce very nice material<\/p>\n

\"calciteiowageode\"
\n7cm geode with 3.5cm calcite crystal. E. Harrington specimen and photo.<\/p>\n

\"Modified
\nMarcasite crystal in geode. FOV 4.5mm. Collected and photographed by David Hanson.<\/p>\n

Dennis Stevenson Geodes:
\n625 S. 18th St., Hamilton, Illinois
\nCall ahead to plan a trip: 309-337-3089 or 217-847-2952
\n$20 for one bucket, $15 for each additional one.<\/p>\n

Mostly quartz based geodes, but some have nice calcite crystals as well. A staple Midwestern geode locality.<\/p>\n

Find out what minerals Iowa is and has produced, check out what is new on eBay
\n<\/a><\/p>\n

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How to prepare your 4\u00d74 for rock collecting - Rockhounding Preparedness Series<\/div><\/div><\/a>