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Welcome to the Biotite Mineral Gallery If you have more items you would like listed on this page please use the link below. --

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Biotite is a brown mineral which shows a property called pleochroism. That is, under a single polarizing filter, the grains change color (from light brown to dark brown) when rotated. Biotite survives a certain amount of weathering and is found in soils, sediments and sedimentary rocks. Weathered biotite becomes relatively brassy or bronzy in color and has been mistaken for gold. Biotite is a very unique mineral that can be easily broken apart into very thin sheets. It is a form of mica that is very soft enough that it can be scratched with a fingernail. Biotite is usually black or brown and is used in a variety of ways. It is usually ground up and added to other things such as paint, waterproofing sealers, and lubricants, or greases.

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