Orientite

General Information: Chemical Formula:Ca2Mn++Mn+++2Si3O10(OH)4 Composition:(Molecular Weight = 557.25 gm)Calcium 14.38 % CaManganese 29.58 % MnSilicon 15.12 % SiHydrogen 0.72 % H Oxygen 40.20 % O  Empirical Formula: Ca2Mn2+Mn3+2Si3O10(OH)4 Locality:Oriente Province, Cuba. Name Origin:Named after its locality.Physical Properties: Cleavage:[001] Indistinct, [120] Indistinct Color:brown or black. Density:3 Diaphaniety:Translucent to opaque Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Hardness:4-5 - Fluorite-Apatite Luster:Vitreous (Glassy) Streak:brownMore details...