Dims: 2.3 x 1.6 x 1.0" (5.8 x 4.1 x 2.6 cm)
Wt: 8.0 oz. (228 g)
Londonderry, Western Australia
The largest Columbite crystal that I have yet seen comprises this hand specimen- apart from a small amount of white host rock and a small book of mica, it consists entirely of Columbite. The crystal is in fair condition, as it shows substantial old breakage and is not quite complete, and its orthorhombic prismatic form is warped. The crystal is black in color, has a dull, waxy luster, and is, of course, opaque.