General Information:
Chemical Formula:
As4S
Composition:
(Molecular Weight = 331.75 gm)
Arsenic 90.33 % As
Sulfur 9.67 % S
Empirical Formula:
As4S
Environment:
Realgar has been altered by deuteric solutions to form the rare mineral duranusite,
IMA Status:
Approved IMA 1973
Locality:
TL: Duranus, Alpes-Meritimes, France. Mina Capillitas, an epithermal deposit in the Province of Catamarca, Argentina.
Name Origin:
Named for the locality.
Physical Properties:
Color:
red.
Density:
4.5
Diaphaniety:
Opaque
Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:
2 - Gypsum
Luster:
Metallic
Streak:
black
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