Indiana Geodes

geodes in Indiana are found in the Bedford Formation near Bloomington and the surrounding areas. The geodes in Indiana were fossils that had hollow centers, such as brachipods or crinoids. As groundwater percolated through the limestone, minerals that were dissolved in the water precipitated in these voids. The most common minerals found in these geodes are quartz and chalcedony, but as many of 40 different minerals have been found. Some times the crystals grow all the way to the center of the geode, making the geode solid.

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