Claudetite

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Claudetite
Oxide minerals
As2 O3
Ctd
4.CB.45
Monoclinic
Prismatic (2/m) (same H-M symbol)
P21/n
a = 5.33 Å, b = 12.98 Å, c = 4.54 Å; β = 94.27°; Z = 4
Colorless to white
Thin tabular crystals, fibrous crusts
Contact or penetration on {100}
Perfect on {010} micaceous
Splintery
Flexible
2.15
Vitreous, pearly on cleavage surfaces
Transparent
4.14–4.15
Biaxial (−)
nα = 1.870 nβ = 1.920 nγ = 2.010
δ = 0.140
58° (measured)

Claudetite is an arsenic oxide mineral with chemical formula As2O3. Claudetite is formed as an oxidation product of arsenic sulfides and is colorless or white. It can be associated with arsenolite (the cubic form of As2O3) as well as realgar (As4S4), orpiment (As2S3) and native sulfur.

It was first described in 1868 for an occurrence in the San Domingo mines, Algarve, Portugal. It was first described by and named for the French chemist Frederick Claudet.

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