Approx Weight (per Strand): 154ct

3 Grams / 7

Strand Length:  43 cm / 17 inches

5 Ounces (including box)

This is a fantastic shatter cone from Canada weighing 903 grams and measuring 12

Biotite Mica Book | Black Crystal | 39 Grams | Ontario, Canada | SO24 Pistacite Approx Weight (per Strand): 154ctThis 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