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Alacranite

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Alacránite
Alacránite (As8S9) is an arsenic sulfide mineral first discovered in the Uzon calderaKamchatkaRussia. It was named for its occurrence in the Alacrán silverarsenicantimony mine, Pampa Larga, Chile. It is generally more rare than realgar and orpiment. Its origin is hydrothermal. It occurs as subhedral to euhedral tabular orange to pale gray crystals that are transparent to translucent. It has a yellow-orange streak with a hardness of 1.5. It crystallizes in the monoclinic crystal system. It occurs with realgar and uzonite as flattened and prismatic grains up to 0.5 mm across.

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Mineralogy Database Dictionary

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Alacranite

General Information:
 Chemical Formula:
As8S9
 Composition:
(Molecular Weight = 887.97 gm)
Arsenic 67.50 % As
Sulfur 32.50 % 
 Empirical Formula:
As8S9
 IMA Status:
Approved IMA 1984
 Locality:
TL: Chile, Alacran, Pampa Larga
Physical Properties:
 Cleavage:
[???] Indistinct
 Color:
red or orange yellow.
 Density:
3.4 - 3.46, Average = 3.43
 Diaphaniety:
Transparent
 Hardness:
1.5 - Between Talc and Gypsum
 Luster:
Adamantine - Greasy
 Streak:
orange
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