Biotite

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Biotite.jpg
Biotite is a common rock-forming mineral of the mica family. Biotite is a black or dark brown silicate rich in iron, magnesium, potassium, aluminum, and, of course, silica. Like other micas, it forms flat book-like crystals that peel apart into individual sheets on cleavage planes.[1]

References

  1. http://wrgis.wr.usgs.gov/docs/parks/misc/glossaryb.html