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Dimorphite

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Formula:
As4S3
System:
Orthorhombic
Colour:
orange-yellow
Lustre:
Adamantine
Hardness:
Name:
From the Greek for two and form, for the two forms that the mineral supposedly occurs in.
This page provides mineralogical data about Dimorphite.


Classification of Dimorphite

Approved, 'Grandfathered' (first described prior to 1959)
2.FA.10

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
2.6.1.1

2 : SULFIDES
6 : AmBnXp, with (m+n):p = 4:3
3.7.3

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
7 : Sulphides etc. of V, As, Sb and Bi

Physical Properties of Dimorphite

Adamantine
Diaphaneity (Transparency):
Transparent
Colour:
orange-yellow
Streak:
yellow
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.58 g/cm3 (Measured)    3.60 g/cm3 (Calculated)

Optical Data of Dimorphite

Type:
Biaxial (+)
Dispersion:
strong

Chemical Properties of Dimorphite

Formula:
As4S3
Elements listed in formula:

Crystallography of Dimorphite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Space Group Setting:
Pnma
Cell Parameters:
a = 11.24 Å, b = 9.90 Å, c = 6.56 Å
Ratio:
a:b:c = 1.135 : 1 : 0.663
Unit Cell Volume:
V 729.97 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Dipyramidal crystals.

Occurrences of Dimorphite

Type Occurrence of Dimorphite

Geological Setting of Type Material:
Fumarolic vent

Relationship of Dimorphite to other Species

Common Associates:
2.FA.AnorpimentAs2S3
2.FA.BonazziiteAs4S4
2.FA.05DuranusiteAs4S
2.FA.15bPararealgarAs4S4
2.FA.15aRealgarAs4S4
2.FA.15dUM1970-18-S:AsAs4S4
2.FA.20AlacrániteAs8S9
2.FA.25UzoniteAs4S5
2.FA.30LaphamiteAs2(Se,S)3
2.FA.30OrpimentAs2S3
2.FA.35GetchelliteAsSbS3
2.FA.40Wakabayashilite[(As,Sb)6S9][As4S5]
3.7.1PatróniteVS4
3.7.2DuranusiteAs4S
3.7.4RealgarAs4S4
3.7.5PararealgarAs4S4
3.7.6AlacrániteAs8S9
3.7.7UzoniteAs4S5
3.7.8OrpimentAs2S3
3.7.9Jeromite
3.7.10LaphamiteAs2(Se,S)3
3.7.11GetchelliteAsSbS3
3.7.12Wakabayashilite[(As,Sb)6S9][As4S5]
3.7.13PääkköneniteSb2AsS2
3.7.14StibniteSb2S3
3.7.15MetastibniteSb2S3
3.7.16TellurantimonySb2Te3
3.7.17BismuthiniteBi2S3
3.7.18NevskiteBi(Se,S)
3.7.19GuanajuatiteBi2Se3
3.7.21IkunoliteBi4(S,Se)3
3.7.22LaitakariteBi4Se2S
3.7.23PoubaitePbBi2(Se,Te,S)4
3.7.24TellurobismuthiteBi2Te3
3.7.25SoučekitePbCuBi(S,Se)3
3.7.26TsumoiteBiTe
3.7.27PilseniteBi4Te3
3.7.28HedleyiteBi7Te3
3.7.29TetradymiteBi2Te2S
3.7.30JoséiteBi4TeS2
3.7.31Joséite-BBi4Te2S
3.7.32IngoditeBi2TeS
3.7.33SulphotsumoiteBi3Te2S
3.7.34KawazuliteBi2Te2Se
3.7.36SkippeniteBi2TeSe2
3.7.37KochkaritePbBi4Te7
3.7.38RucklidgeitePbBi2Te4
3.7.39AleksitePbBi2Te2S2
3.7.40JunoiteCu2Pb3Bi8(S,Se)16

Other Names for Dimorphite

Name in Other Languages:
Simplified Chinese:硫砷矿
Spanish:Dimorphita

Other Information

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 Dimorphite

Reference List:
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 197-198.

Neues Jahrbuch für Mineralogie, Monatshefte (1981): 416-432.

Zeitschrift für Kristallographie: 138: 161-166.

Bonazzi, P. & Bindi, L. (2008): A crystallographic review of arsenic sulfides: Effects of chemical variations and changes induced by exposure to light. Zeitschrift für Kristallographie, 223, 132-147.

Internet Links for Dimorphite

mindat.org URL:
https://www.mindat.org/min-1292.html
Please feel free to link to this page.

Localities for Dimorphite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Chile
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
          • Alacrán
Handbook of Mineralogy
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Plaka
Katerinopoulos, A. (1996): Bisher nicht bekannte Minerale aus den Lavrion-Bergwerken. Lapis, 21 (11), 39; 62.
No reference listed
Italy
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Campostrini, I. & Russo, M. (2012): Lafossaite e dimorphite: due nuove specie per il Vesuvio. Micro, 3/2012, 136-141
    • Phlegrean Volcanic Complex
      • Naples Province
        • Phlegrean Fields
          • Pozzuoli
Scacchi, A., (1852): Über die in den Fumarolen der phlegräischen Gefilde vorkommenden Substanzen, Journal für praktische Chemie, Vol. 55, 54-59
Peru
 
  • Pasco department
    • Pasco province
      • Cerro de Pasco
No reference listed
Mineral and/or Locality  
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