8.1" Big Book Jet Black BIOTITE MICA Crystal Sheets Bear Lake Ontario for sale

$50.00
Product Code: EB1218BIOT5
Availability: In Stock
 
Qty: + -
Location Bear Lake diggings, Monmouth Township, Haliburton Co., Ontario, Canada
Size 8.1" x 4.6" x 0.7"
Suggested Stand Medium 5" Easel Stand

This is a specimen of biotite mica that is the iron-rich, dark brownish black cousin of muscovite mica. This piece is crystallized in a "book" of thin sheets, layered on atop another in "slices" that split apart easily. The mineral name biotite is now discredited by the AMA, but it continues to be used as a group name for other minerals including phlogopite, annite, siderophyllite, and eastonite.