Mineralogy Database

Dimorphite Mineral Data

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General Dimorphite Information

Help on Chemical  Formula: Chemical Formula: As4S3
Help on Composition: Composition: Molecular Weight = 395.88 gm
   Arsenic  75.70 %  As
   Sulfur   24.30 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: As4S3
Help on Environment: Environment: Deposited at a fumerolic vent at temperatures of about 70-80 degrees Celcius.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1850
Help on Locality: Locality: From the Solfatara, Campi Flegrei, near Naples, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "two" and "form," in reference to the two forms in which the species was thought to occur.
Help on Name Pronunciation: Name Pronunciation: Dimorphite + Pronunciation Say DIMORPHITE

Dimorphite Image

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Comments: Orange to yellow-orange crystals of dimorphite on matrix.
Location: Solfatara di Pozzuoli, Vesuvius, Naples, Naples province, Campania, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Dimorphite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1353:1:0.6626
Help on Cell Dimensions: Cell Dimensions: a = 11.24, b = 9.9, c = 6.56, Z = 4; V = 729.97 Den(Calc)= 3.60
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.95(1), 3.92(0.9), 2.13(0.8),

Physical Properties of Dimorphite

Help on Cleavage: Cleavage: None
Help on Color: Color: Orange.
Help on Density: Density: 3.58 - 3.6, Average = 3.59
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 1.5 - Between Talc and Gypsum
Help on Luster: Luster: Adamantine
Help on Streak: Streak: yellow

Optical Properties of Dimorphite

Help on Optical Data: Optical Data: Biaxial (+)

Calculated Properties of Dimorphite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.27 gm/cc
note: Specific Gravity of Dimorphite =3.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0018224638
Boson Index = 0.9981775362
Help on Photoelectric: Photoelectric: PEDimorphite = 55.13 barns/electron
U=PEDimorphite x rElectron Density= 180.48 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dimorphite is Not Radioactive

Dimorphite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.06)where Am Bn Xp, with (m+n):p=4:3
  (02.06.01)Dana Group Dimorphite As4S3 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.FA.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  02.FA -With As, (Sb), S
02.FA.10 Dimorphite As4S3 P nma 2/m 2/m 2/m

Other Dimorphite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Dimorphite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 02.FA.10





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