General Information:
Chemical Formula:
Fe++4Be3(SiO4)3S
Composition:
(Molecular Weight = 558.74 gm)
Beryllium 4.84 % Be
Iron 39.98 % Fe
Silicon 15.08 % Si
Sulfur 5.74 % S
Oxygen 34.36 % O
Empirical Formula:
Fe2+4Be3(SiO4)3S
Locality:
Essex Co., Massachusetts, USA.
Physical Properties:
Cleavage:
[111] Indistinct
Color:
brown, brownish black, grayish yellow, pink, or reddish brown.
Density:
3.43
Diaphaniety:
Transparent to Translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Greasy
Streak:
gray white
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