General Information:
Chemical Formula:
Mn++3Al2(SiO4)3
Composition:
(Molecular Weight = 495.03 gm)
Manganese 33.29 % Mn
Aluminum 10.90 % Al
Silicon 17.02 % Si
Oxygen 38.78 % O
Empirical Formula:
Mn2+3Al2(SiO4)3
Environment:
Magmatic, metamorphic, and pegmatitic rocks.
Locality:
Spessart, Germany.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[???] Distinct
Color:
red, reddish orange, yellowish brown, reddish brown, or brown.
Density:
4.18
Diaphaniety:
Transparent to translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Crystalline - Fine - Occurs as well-formed fine sized crystals., Lamellar - Thin laminae producing a lamellar str ucture.
Hardness:
6.5-7.5
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Resinous
Streak:
white
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