Dims: 2.82" x 2.0" x 1.6" (7.1 x 5.1 x 4.1 cm)
Wt: 4.8 oz. (137.3 g)
Mashamba Mine, Kolwezi, Zaire
This specimen consists of a variety of different minerals that rest on a limestone base rock, the most notable being a crust made up of pale pink Sphaerocobaltite crystals. This crust is in fair condition, as many of the crystals that make it up are damaged, and some are incomplete. The largest of these has dimensions of 0.5 x 0.3 x 0.3" (1.3 x 0.8 x 0.8 cm) and has a cleaved tip. Amidst the damage, all of the crystals show good trigonal scalenohedral "dogtooth" form, with well-defined edges and clean faces that possess a rather dull pearly-to-waxy luster. All have a pale pink color that deepens slightly towards their bases and are translucent to dimly transparent, showing much cloudiness. On top of the Sphaerocobaltite crust rest several warped reniform formations of malachite. Most of these formations are also damaged, but there are several noticeable spiky crystals among them that achieve lengths of 0.1" (3 mm) and have excellent monoclinic form, though magnification is needed to properly study them. The malachite has the standard dark green coloration, and its individual crystals possess a vitreous luster. On the opposite side of the specimen is another crust made up of mostly broken and incomplete Sphaerocobaltites; several large and incomplete cuprites are intergrown with this crust. They have the standard deep-red-to-gray coloration and submetallic luster of cuprite, and where applicable, show good form. Their color is so deep that one needs a halogen light or sunlight to accurately assess their transparence and clarity.