General Information:
Chemical Formula:
Mn8Si6O15(OH,Cl)10
Composition:
(Molecular Weight = 1,064.20 gm)
Manganese 41.30 % Mn
Silicon 15.83 % Si
Hydrogen 0.71 % H
Chlorine 8.33 % Cl
Oxygen 33.83 % O
Empirical Formula:
Mn2+8Si6O15(OH)7.5Cl2.5
Environment:
Metamorphosed manganese ore deposits.
Locality:
Adervielle, Hautes Pyrenees, France.
Physical Properties:
Cleavage:
[010] Perfect
Color:
brown, brown red, yellow, light pink, or dark red.
Density:
3.07
Diaphaniety:
Transparent to translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Tabular - Form dimensions are thin in one direction.,
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
pink
More details...