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Ferroindialite on scoria


Ferroindialite on scoria

4 x 2 x 1 cm - Miniature 
Durham Ranch, Campbell Co., Wyoming, United States

All of the brick red is ferroindialite, which occurs as a thin alteration on baked clays known as "scoria". Some people call the scoria a paralava. If you live in Wyoming, you call it gravel, since this is what they use on the roads. It is formed from ancient burning underground coal seems which baked the overlying clays. Topographically the scoria looks like small cinder cones across the Wyoming plains. There are several interesting minerals that have resulted from this geological process.

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