General Information:
Chemical Formula:
Mn5(SiO4)2(OH)2
Composition:
(Molecular Weight = 492.87 gm)
Manganese 55.73 % Mn
Silicon 11.40 % Si
Hydrogen 0.41 % H
Oxygen 32.46 % O
Empirical Formula:
Mn2+5(SiO4)2(OH)2
Environment:
Manganese vein deposits.
Locality:
TL: Bald Knob, Alleghany Co., North Carolina, USA.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
None
Color:
white, brown, bright pink, or grayish pink.
Density:
4
Diaphaniety:
Transparent to Subtransparent to translucent
Habits:
Massive - Lamellar - Distinctly foliated fine-grained forms., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
Hardness:
6-5
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
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