General Information:
Chemical Formula:
Fe++CO3
Composition:
(Molecular Weight = 115.86 gm)
Iron 48.20 % Fe
Carbon 10.37 % C
Oxygen 41.43 % O
Empirical Formula:
Fe2+(CO3)
IMA Status:
Approved IMA 1960
Name Origin:
From the Greek sideros - "iron."
Physical Properties:
Cleavage:
[1011] Perfect, [1011] Perfect, [1011] Perfect
Color:
yellowish brown, brown, gray, yellowish gray, or greenish gray.
Density:
3.96
Diaphaniety:
Translucent to subtranslucent
Habits:
Tabular - Form dimensions are thin in one direction., Massive - Uniformly indistinguishable crystals forming large masses., Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Hardness:
3.5 - Copper Penny
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
white
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