SEPTARIAN GEODE
| This type of geode is sedimentary, which formed in an
ancient sea floor about 50 million years ago. This is different from
most geodes which are volcanic in nature. The septarian geode's
golden star-like centers are the result of the crystallization of the
mineral calcite, framed by aragonite. Some are filled in completely
with calcite, while others left hollows showing the tooth-like calcite
crystals and in rare cases, some perfect crystals of barite as well.
Septarians are found almost exclusively in Utah.
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