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
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