Dims: 3.0 x 2.1 x 2.0" (7.6 x 5.3 x 5.1 cm)
Wt: 5.9 oz. (166 g)
Brumado Mine, Bahia, Brazil
This small hand specimen consists of a cluster of partly intergrown Magnesite rhombohedrons. The specimen is in moderately good condition, as most of the crystals show at least some minor damage, and many of the smaller ones at the base of the specimen are badly broken and incomplete. The largest of these has dimensions of 1.5 x 1.5 x 0.8" (3.8 x 3.8 x 2.0 cm), and like the others, has good rhombohedral form, with well-defined edges and flat, clean faces that possess a pearly luster. All are colorless, transparent, and dimly clear due to intense internal fracturing and some cloudy inclusions. They are also covered with crusts that are made up of scores of tiny, round and intergrown hematite nodules. These nodules generally have a red-brown coloration and a dull luster, but a few show a dark silver-gray coloration and dull metallic luster. There is also a large, incomplete crystal of a gray metallic mineral- it is in the center of the Magnesite cluster, and the crystals seem to have grown off of it. It must be made of hematite, as there is a lot of it elsewhere on the specimen, and it is too hard to be galena.