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Biotite mica is a common rock forming mineral, being present in at least some percentage in most igneous and both regional and contact metamorphic rocks. The typical black to brown color of biotite is characteristic although it is difficult to distinguish brown biotite from dark brown phlogopite.

Biotite is both an interesting and beautiful addition to every respectable rock collection
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Greenback Mine Biotite Mica Specimen 1
Sale Price: $9.99

This specimen was mined at the historic Greenback Mine in Woody, CA, a former copper mine well known in Southern California.