Claudetite

(repeating unit)As2 O3IMA symbolCtd[1]Strunz classification4.CB.45Crystal systemMonoclinicCrystal classPrismatic (2/m)
(same H-M symbol)Space groupP21/nUnit cella = 5.33 Å, b = 12.98 Å,
c = 4.54 Å; β = 94.27°; Z = 4IdentificationColorColorless to whiteCrystal habitThin tabular crystals, fibrous crustsTwinningContact or penetration on {100}CleavagePerfect on {010} micaceousFractureSplinteryTenacityFlexibleMohs scale hardness2.15LusterVitreous, pearly on cleavage surfacesDiaphaneityTransparentSpecific gravity4.14–4.15Optical propertiesBiaxial (−)Refractive indexnα = 1.870 nβ = 1.920 nγ = 2.010Birefringenceδ = 0.1402V angle58° (measured)References[2][3][4]

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.[2]

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.[3]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b Handbook of Mineralogy
  3. ^ a b Claudetite data on Webmineral
  4. ^ Claudetite on Mindat


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