Dims: 2.6" x 1.5" x 0.9"(6.6 x 3.8 x 2.3 cm)
Wt: 2.76 oz.(78.4 g)
Kisenge Mine, Zaire
On a botroidal bed that looks a lot like psilomelane, several dozen minute Polianite crystals rest in a cluster. Like Pyrolusite(which it is a variety of), the Polianite has a dark gray color, metallic to waxy luster, and is opaque. The difference, however, is in the crystals. The Polianite occurs in well-formed tetragonal prisms with wedge-shaped terminations. Though they are small(2 x 1 x 1 mm maximum), their crystal form is visible to the naked eye, although magnification will help considerably. The botryoidal base is made up of Pyrolusite, and possibly other manganese oxide minerals.