Dims: 1.7 x 1.6 x 0.7" (4.2 x 1.1 x 1.9 cm)
Wt: 21 g
Total Wreck Mine, Pima County, Arizona, U.S.A.
This hand specimen consists of a crust of tiny Mottramite crystals that rests on what appears to be a base made up of a descloizite druse. These Mottramites are in good condition - some damage to the druse is visible - and all are microscopic in size. Thus, they are too small to effectively study even with a loupe. All are black in color and have a sparkling, vitreous luster. The black color is likely caused by inclusions of goethite or some other oxide. The crystals that serve as the base actually look more like hopeite than descloizite - I really cannot be sure what they are.