General Information:
Chemical Formula:
Cu2FeSnS4
Composition:
(Molecular Weight = 429.91 gm)
Iron 12.99 % Fe
Copper 29.56 % Cu
Tin 27.61 % Sn
Sulfur 29.83 % S
Empirical Formula:
Cu2Fe2+SnS4
Locality:
Cornwall at Wheal Rock near St. Agnes.
Name Origin:
From the Latin stannum - "tin."
Physical Properties:
Cleavage:
[110] Imperfect
Color:
blue, grayish black, or steel gray.
Density:
4.3 - 4.5, Average = 4.4
Diaphaniety:
Opaque
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
None.
Luster:
Metallic
Streak:
black
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