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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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Biotite Mica Specimens
Biotite Mica 2 1/2 Inch Set of 3 Pieces
Sale Price: $5.99

Very solid book mica from a Southern California pegmatite with nice dark golden color. You will receive one bag containing 3 pieces of mica that are 1 inch to 2 inch size specimens.