Dims: 2.3" x 1.5" x 1.3" (5.8 x 3.8 x 3.3 cm)
Wt: 4.91 oz. (139.4 g)
Minas Gerais, Brazil
This small hand specimen consists of a portion of a botryoidal crust of Hematite that is often called kidney stone. It has a few interesting aspects to it. Most of its outer surface has a rather rough, pebbly texture that dulls its metallic luster. Only a small portion of this surface has a very smooth texture that enables one to see its metallic luster at its brightest. Examination of the crust's cross-section shows a distinctly radial pattern that suggests that the material had an almost fibrous habit at some point. Examination of its botryoidal surface, however, shows patterns that suggest concentric layering. After thinking about it, it would seem that the material DID form in a nearly acicular fashion, but was then partially covered over with smoother layers of Hematite. Examination of the specimen's underside shows a distinct lack of any host rock or material and the distinct red coloration of decayed Hematite.