Rockhounding In Iowa

By Randy Porter
From page 20 of the April, 1980 issue of Rock Hound
Copyright © 1980 Lost Treasure, Inc. all rights reserved

When you say Iowa, many people think of cornfields and cows. But Iowa has much to offer in the fascinating pursuit of mineral collecting, according to rockhound and geologist Paul J. Horick of the Iowa Geological Survey at Iowa City.
Although Horick describes over 50 minerals in his book, The Minerals of Iowa, one specimen most Iowa rock-hounds have in their collection is the colonial fossil coral, Heragonaria.
The skeletal remains of corals and many fossils including sponges and echinoderms are made entirely of calcite. The crystallization of calcite, which is plentiful in Iowa, is hexagonal or six-sided.
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