Orientite

General Information:
 Chemical Formula:
Ca2Mn++Mn+++2Si3O10(OH)4
 Composition:
(Molecular Weight = 557.25 gm)
Calcium 14.38 % Ca
Manganese 29.58 % Mn
Silicon 15.12 % Si
Hydrogen 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:
brown
More details...