Dims: 2.0" x 1.8" x 0.4" (5.1 x 4.6 x 1.0 cm)
Wt: 1.75 oz. (49.6 g)
Sarany, Ural Mountains, Russia
This small hand specimen consists of a flat slab of dark gray, igneous host rock that is partially coated with a few dozen dodecahedral Uvarovite crystals. These crystals do not generally exceed 1 mm in diameter, and are generally in moderately good condition, though several of them show considerable damage and are incomplete. They have the standard emerald-green color that one expects, are translucent to transparent, and have a bright, vitreous luster. Their form, where undamaged, is quite good, though intergrowth prevents any of the crystals from being more than 50% complete. An odd addition to this piece is the presence of a dull, massive, fuschia-colored material that partially coats the Uvarovite crust, obscuring over 50% of the crystals. It has the general color of the mineral charoite, but is soft enough to be scratched with a fingernail. According to a knowledgeable browser who just wrote to me (thanks, Tim!), the material is likely stichtite, a hydrated magnesium chromium carbonate hydroxide.