Dims: 1.7" x 1.2" x 1.0" (4.3 x 3.0 x 2.5 cm)
Wt: 1.45 oz. (41.0 g)
Kisenge Mine, Zaire
This large thumbnail specimen consists of a small chunk of Pyrolusite that shows mostly massive and botryoidal form. Much of its surface is caused by its separation from its place of formation, but a substantial portion shows excellent botryoidal form, with intergrown nodules of a relatively uniform size and arrangement. A few tiny hollows extend into the breakage surfaces; these are lined with tiny crystals of a variety of Pyrolusite that is known as Polianite, which forms crystals that are generally thicker and more substantial than regular Pyrolusite crystals. All of the Pyrolusite has a dark gray color and a dull to moderate metallic luster. There is no other material or host rock on the specimen.