Dims: 2.5 x 2.4 x 1.9" (6.4 x 6.1 x 4.8 cm)
Wt: 7.5 oz. (213.4 g)
Lipscombe Deposit, Monmouth Township, Wiberforce, Ontario, Canada
This small hand specimen consists of at least 3 thick "books" of hexagonal Biotite platelets. These books are in good condition, though two of them appear to have been cleaved, likely during the mining of the piece. They reach dimensions of 1.3 x 1.1 x 0.9" (3.3 x 2.8 x 2.3 cm) and show a definite hexagonal outline, though large portions of their prism faces are severely warped. Those portions that are not warped, however, are remarkably smooth and do not resemble the prism faces on most of the mica-group specimens that I have seen. They have the standard black coloration with some subtle brown highlights and the classic pearly luster on their cleaved faces- however, the intact faces possess a much duller, waxy luster. All are essentially opaque. The Biotite books rest on a base of semicrystalline calcite that glows a bright orange under UV light. Embedded in this calcite rest several pale yellow-green apatite crystals that are mostly incomplete and have a very warped hexagonal prismatic form. They are transparent and very clear, and possess a vitreous luster.