Dims: 1.6 x 1.0 x 0.9" (4.1 x 2.5 x 2.3 cm)
Wt: 18.7 g
Brumado Mine, Bahia, Brazil
This thumbanil specimen consists entirely of a cluster of trigonal rhombohedral Magnesite crystals. The largest of these crystals has dimensions of 0.7 x 0.6 x 0.5" (1.8 x 1.5 x 1.3 cm), and is not quite complete but shows no human-induced damage. Only one crystal in the cluster is damaged, and this damage basically consists of a small surface where a corner was cleaved off, and an adjacent internal fracture. All the crystals show exceptional form, with sharp edges and very clean faces that possess a bright vitreous luster. They are colorless, transparent, and moderately clear, as all contain internal fractures and flaws that run along their cleavage planes. Their faces are dusted with a very sparse layer of fine hematite, most of which is trapped just under the surface. There is no host rock present, and the cluster's base is made up of a jumble of more smaller, broken, and incomplete Magnesites.