General Information:
Chemical Formula:
Fe+++2(SO4)3·9(H2O)
Composition:
(Molecular Weight = 562.02 gm)
Iron 19.87 % Fe
Hydrogen 3.23 % H
Sulfur 17.12 % S
Oxygen 59.78 % O
Empirical Formula:
Fe3+2(SO4)3·9(H2O)
Name Origin:
Named after the province of Coquimbo, Chile.
Physical Properties:
Cleavage:
[1011] Imperfect
Color:
greenish white, bluish white, light violet, yellowish white, or brownish white.
Density:
2 - 2.1, Average = 2.04
Diaphaniety:
Transparent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Platy - Sheet forms (e.g. micas)., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
2 - Gypsum
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
white
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