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Anorpiment

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About AnorpimentHide

Formula:
As2S3
Colour:
Greenish yellow
Lustre:
Resinous, Pearly
Hardness:
Specific Gravity:
3.33
Crystal System:
Triclinic
Name:
Named for its triclinic (anorthic) symmetry and its dimorphous relationship to orpiment.
Dimorph of:
This page provides mineralogical data about Anorpiment.


Classification of AnorpimentHide

Approved
Approval Year:
2011
2.FA.

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
A : With As, (Sb), S

Pronounciation of AnorpimentHide

Pronounciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of AnorpimentHide

Resinous, Pearly
Transparency:
Transparent
Comment:
Resinous on crystal faces, pearly on cleavage surfaces
Colour:
Greenish yellow
Streak:
Yellow
Hardness:
1½ on Mohs scale
Tenacity:
Sectile
Cleavage:
Perfect
Perfect and easy on {001}
Fracture:
Irregular/Uneven
Density:
3.33 g/cm3 (Measured)    3.321 g/cm3 (Calculated)

Optical Data of AnorpimentHide

Type:
Biaxial (-)
Comments:
All indices of refraction are greater than 2.

Chemical Properties of AnorpimentHide

Formula:
As2S3

Crystallography of AnorpimentHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 5.7577(2) Å, b = 8.7169(3) Å, c = 10.2682(7) Å
α = 78.152(7)°, β = 75.817(7)°, γ = 89.861(6)°
Ratio:
a:b:c = 0.661 : 1 : 1.178
Unit Cell V:
488.38 ų
Z:
4
Morphology:
The crystal forms include {010}, {110}, {110}, {001}, {021} and {021}. The faces of the {110} and {110} forms are typically incompletely formed and cavernous.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.867 Å(97)
4.519 Å(77)
3.609 Å(82)
2.880 Å(75)
2.552 Å(100)
2.469 Å(96)

Type Occurrence of AnorpimentHide

General Appearance of Type Material:
Drusy coatings of wedge shaped crystals up to 0.2 mm.
Place of Conservation of Type Material:
Two cotype specimens are deposited in the Natural History Museum of Los Angeles County, catalogue numbers 63514 and 63544. One cotype is deposited in the collections of the Mineral Museum of the University of Arizona, catalogue number 19326.

Synonyms of AnorpimentHide

Other Language Names for AnorpimentHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
17 photos of Anorpiment associated with OrpimentAs2S3
9 photos of Anorpiment associated with GalenaPbS
6 photos of Anorpiment associated with BaryteBaSO4
4 photos of Anorpiment associated with ChalcopyriteCuFeS2
4 photos of Anorpiment associated with SphaleriteZnS
4 photos of Anorpiment associated with QuartzSiO2
3 photos of Anorpiment associated with RealgarAs4S4
2 photos of Anorpiment associated with PyriteFeS2

Related Minerals - Nickel-Strunz GroupingHide

2.FA.BonazziiteAs4S4Mon. 2/m : B2/b
2.FA.05DuranusiteAs4SOrth. mmm (2/m 2/m 2/m) : Pmna
2.FA.10DimorphiteAs4S3Orth. mmm (2/m 2/m 2/m) : Pnma
2.FA.15bPararealgarAs4S4Mon. 2/m : P21/b
2.FA.15aRealgarAs4S4Mon. 2/m
2.FA.15dUM1970-18-S:AsAs4S4Mon. 2/m : B2/b
2.FA.20AlacrániteAs8S9Mon. 2/m : P2/b
2.FA.25UzoniteAs4S5Mon.
2.FA.30LaphamiteAs2Se3Mon. 2/m
2.FA.30OrpimentAs2S3Mon. 2/m
2.FA.35GetchelliteAsSbS3Mon. 2/m : P21/b
2.FA.40Wakabayashilite[(As,Sb)6S9][As4S5]Orth. mm2 : Pna21

Other InformationHide

Notes:
Insoluble in concentrated HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AnorpimentHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Downs, R.T., Housley, R.M., Jenkins, R.A. & Hyrsl, J. (2011): Anorpiment, As2S3, the triclinic dimorph of orpiment. Mineralogical Magazine, 75, 2857-2867.

Internet Links for AnorpimentHide

Localities for AnorpimentHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Peru (TL)
 
  • Huancavelica
    • Castrovirreyna Province
Kampf, A.R., Downs, R.T., Housley, R.M., Jenkins, R.A. & Hyrsl, J. (2011): Anorpiment, As2S3, the triclinic dimorph of orpiment. Mineralogical Magazine, 75, 2857-2867
 
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