Diamond

General Information: Chemical Formula:C Composition:(Molecular Weight = 12.01 gm)Carbon 100.0 % C  Empirical Formula: C Environment:Gas rich, ultra-basic diatremes from mantle depths (>30 km)and alluvial placer deposits derived from the Kimberlite rocks. Kimberlite = olivine, garnet, pyroxene, and calcite. Locality:Kimberly, republic of South Africa. India. Brazil. Ural Mountains, Russia. Murfreesboro, Arkansas, USA. Name Origin:From the Greek, adamas, meaning "invincible" or "hardest."Physical Properties: Cleavage:[111] Perfect, [111] Perfect, [111] Perfect Color:colorless, white, gray, black, or blue. Density:3.5 - 3.53, Average = 3.51 Diaphaniety:Transparent to Subtransparent to translucent Habits:Euhedral Crystals - Occurs as well-formed crystals showing good external form., Granular - Generally occurs as anhedral to subhedral crystals in matrix., Hardness:10 - Diamond Luminescence:Fluorescent. Luster:Adamantine Streak:colorlessMore details...