Radtkeite

General Information:
 Chemical Formula:
Hg3S2ClI
 Composition:
(Molecular Weight = 828.26 gm)
Mercury 72.65 % Hg
Sulfur 7.74 % S 
Iodine 15.32 % I 
Chlorine 4.28 % Cl
 Empirical Formula:
Hg3S2ClI
 Environment:
Secondary Hg mineral.
 IMA Status:
Approved IMA
 Locality:
McDermitt mercury mine, Humboldt County, Nevada, USA.
 Name Origin:
Named for Arthur S. Radtke (1936-), geologist, U. S. Geological Survey.
Physical Properties:
 Cleavage:
[010] Perfect, [001] Very Good, [100] Very Good
 Color:
bright yellow orange or orange.
 Density:
7
 Diaphaniety:
Translucent to Opaque
 Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
 Hardness:
2-3 - Gypsum-Calcite
 Luster:
Adamantine
 Streak:
yellow orange
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