Arsenic minerals

Short description: Group of minerals

Arsenic

General
Category| Mineral
Formula
(repeating unit)| FeAsS (arsenopyrite)
Strunz classification| 01.CA.05
Dana classification| 01.03.01 (Arsenic Group)
Crystal system| Monoclinic
Crystal class| Sulphide
Space group| Trigonal, hexagonal scalenohedral
Identification
Colour| Lead gray, grey, white
Crystal habit| Lamellar, nodular, reniform
Cleavage| Perfect
Fracture| Subconchoidal, uneven
Mohs scale hardness| 3.5
Streak| Black
Diaphaneity| Opaque
Density| 5.7

The arsenic minerals or arsenic group are a group of trigonal symmetry minerals composed of arsenic-like elements, and one alloy.[1]

The elements are arsenic, antimony and bismuth.[2] The alloy is stibarsen (SbA) an alloy of arsenic and antimony.[3]

## References

1. ↑ "Arsenic Mineral Data". http://webmineral.com/data/Arsenic.shtml.
2. ↑ "Arsenic: The mineral native Arsenic information and pictures" (in en-US). http://www.minerals.net/MineralDefinition.aspx?name=arsenic.
3. ↑ "Stibarsen". https://www.mindat.org/min-3775.html.

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