Biotite Mica Book | Black Crystal | 33.3 Grams | Ontario, Canada | SO24

This is a sharp, 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 "books" of biotite can grow to considerable size and can make impressive mineral specimens. 

Name:  Biotite Mica  
Specimen Size:  Large Cabinet-Sized  
Dimensions:  110x49x3 mm / 4.3x1.9x0.1 inches  
Weight:  33.3 Grams / 1.2 Ounces  
Origin:  Ontario, Canada