General Information:
Chemical Formula:
(Mg,Fe++,Fe+++)3[(Mg,Fe++,Fe+++)2Al]Si3AlO10(OH)8/(Mg,Fe++)Si4O10(OH)2
Environment:
Meta-evaporite sequence.
IMA Status:
Approved IMA 1980
Locality:
El Mourdur Hill, near Derran, 35 km W of Ksar El Boukhari, Tell Atlas Mountians, Algeria.
Name Origin:
Named for Holger Kulke, geologist, Essen, Germany.
Physical Properties:
Cleavage:
[001] Perfect
Color:
colorless.
Density:
2.7
Diaphaniety:
Transparent
Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:
2 - Gypsum
Luster:
Pearly
Streak:
white
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