General Information:
Chemical Formula:
(Mn,Fe++)7[Si7O21]
Composition:
(Molecular Weight = 1,507.86 gm)
Manganese 21.86 % Mn
Iron 3.70 % Fe
Silicon 52.15 % Si
Oxygen 22.28 % O
Empirical Formula:
Fe2+Mn2+64(Si7)O21
Environment:
Metamorphic and contact metasomatism of Mn-bearing rocks. Forms a series with pyroxferroite
Locality:
Tunaberg, Sweden.
Name Origin:
Named after its resemblance to the pyroxenes and containing manganese.
Physical Properties:
Cleavage:
[110] Perfect, [110] Perfect
Color:
pink, rose pink, purplish pink, yellowish red brown, or brown.
Density:
3.8
Diaphaniety:
Transparent to translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Massive - Granular - Common texture observed in granite and other igneous rock.,
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
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