Biotite Mica Book | Black Crystal | 45 Grams | Ontario, Canada | SO24 L4 and that it looked like

and that it looked like it was giving off ‘flashes of fire’

As the marcasite breaks down

6 Grams / 5

Origin: Durango

Biotite Mica Book | Black Crystal | 45 Grams | Ontario, Canada | SO24 L4 and that it looked likeThis is a beautiful black Biotite crystal book from the Calcite Vein Dikes of the Grenville Geological Province Ontario, Canada. This specimen is a great example of both the classic crystal shape and attractive dark coloration. Biotite is rarely considered a valuable mineral specimen, but it can accompany other minerals and compliment them. In Bancroft, Ontario, Biotite forms large crystals with green apatite and hornblende. Single large plates or