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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. Nice dark golden color and packaged in 3 pieces per order of 1" to 2" specimens.
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.
Greenback Mine Biotite Mica Specimen 2
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.
Greenback Mine Biotite Mica Specimen 4
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.
Greenback Mine Biotite Mica Specimen 5
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.
Greenback Mine Biotite Mica Specimen 6
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.
Greenback Mine Biotite Mica Specimen 7
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.
Biotite Mica & Quartz Specimen 7
Sale Price: $11.99

These ARE UNIQUE healing crystals. They are biotite mica wrapped around a core of white granulated crystal quartz! These were mined from a Southern California pegmatite that was mined during WWII for very high silica content quartz crystals for sonar devices.
Biotite Mica & Quartz Specimen 12
Sale Price: $11.99

These ARE UNIQUE healing crystals. They are biotite mica wrapped around a core of white granulated crystal quartz! These were mined from a Southern California pegmatite that was mined during WWII for very high silica content quartz crystals for sonar devices.