Dimensions:  103x35x52 mm / 4

Dimensions: 60x46x36 mm / 2

Color:  Black with Yellow 6 Rays Star

Weight: 35

Biotite Mica Book | Black Crystal | 275.6 Grams | Ontario, Canada | SO24 Wolframite Dimensions: 103x35x52 mm / 4This 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.