Dims: 2.2 x 1.7 x 1.5" (5.6 x 4.3 x 3.8 cm)
Wt: 3.68 oz. (104.5 g)
Mistake Mine, Yavapai County, Arizona, U.S.A.
A crust of heavily-intergrown Ramsdellite crystals partly coats the sparse brown host rock of this piece. These crystals reach dimensions of 0.3 x 0.2 x 0.1 (9 x 5 x 3 mm) and are generally in fair-to-good condition, as much damage is visible. Even with their intense intergrowth, their orthorhombic prismatic form is quite good, with relatively well-defined edges and clean faces. All have a dark gray-black coloration and a slightly dull metallic luster, and tend to have a powdery coating that wears off easily. The host rock on which they rest strongly resembles volcanic rock, as it is hard and quite porous.