General Information:
Chemical Formula:
Na2Fe+++(SO4)2(OH)·3(H2O)
Composition:
(Molecular Weight = 365.01 gm)
Sodium 12.60 % Na
Iron 15.30 % Fe
Hydrogen 1.93 % H
Sulfur 17.57 % S
Oxygen 52.60 % O
Empirical Formula:
Na2Fe3+(SO4)2(OH)·3(H2O)
Name Origin:
Named after its composition. Also after its occurrence in the Urus Plateau, Isle Cheleken, Caspian Sea.
Physical Properties:
Cleavage:
[100] Perfect
Color:
yellow, yellow, yellow brown, or pale orange.
Density:
2 - 2.5, Average = 2.25
Habits:
Fibrous - Crystals made up of fibers., Nodular - Tuberose forms having irregular protuberances over the surface., Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
1.5-2 - Talc-Gypsum
Luster:
Vitreous - Dull
Streak:
pale yellow
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