Biotite Mica Book | Black Crystal | 275.6 Grams | Ontario, Canada | SO24 Dolomite Dimensions: 46x28x22 mm / 1

Dimensions:   46x28x22 mm / 1

Dimensions: 36x11x15 mm / 1

which is a type of microcrystalline quartz

This deformed rock fragments and partly molten are imbedded in a melt matrix showing typical flow structures from former melt

Biotite Mica Book | Black Crystal | 275.6 Grams | Ontario, Canada | SO24 Dolomite Dimensions: 46x28x22 mm / 1This is a sharp, beautiful, black Biotite crystal book from the Calcite Vein Dikes of the Grenville Geological Province Ontario, Canada. This biotite has classic crystal shape and attractive dark black coloration. This specimen is a great example of both, 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.