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Dimorphite Mineral Data
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General Dimorphite Information
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 Chemical Formula: |
As4S3 |
| Composition: |
Molecular Weight = 395.88 gm |
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Arsenic 75.70 % As |
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Sulfur 24.30 % S |
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______ |
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100.00 % |
| Empirical Formula: |
As4S3 |
| Environment: |
Deposited at a fumerolic vent at temperatures of about 70-80 degrees Celcius. |
| IMA Status: |
Valid Species (Pre-IMA) 1850 |
| Locality: |
From the Solfatara, Campi Flegrei, near Naples, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek for "two" and "form," in reference to the two forms in which the species was thought to occur. |
| Name Pronunciation: |
Dimorphite + Pronunciation  |
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Dimorphite Image |
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Images:
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Dimorphite
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 |
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Dimorphite Crystallography
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| Axial Ratios: |
a:b:c =1.1353:1:0.6626 |
| Cell Dimensions: |
a = 11.24, b = 9.9, c = 6.56, Z = 4; V = 729.97 Den(Calc)= 3.60 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma |
| X Ray Diffraction: |
By Intensity(I/Io): 2.95(1), 3.92(0.9), 2.13(0.8), |
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Physical Properties of Dimorphite
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| Cleavage: |
None |
| Color: |
Orange. |
| Density: |
3.58 - 3.6, Average = 3.59 |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Hardness: |
1.5 - Between Talc and Gypsum |
| Luster: |
Adamantine |
| Streak: |
yellow |
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Optical Properties of Dimorphite
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| Optical Data: |
Biaxial (+) |
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Calculated Properties of Dimorphite
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| Electron Density: |
Bulk Density (Electron Density)=3.27 gm/cc
note: Specific Gravity of Dimorphite =3.60 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0018224638
Boson Index = 0.9981775362 |
| Photoelectric: |
PEDimorphite = 55.13 barns/electron
U=PEDimorphite x rElectron Density= 180.48 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dimorphite is Not Radioactive |
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Dimorphite Classification
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| Dana Class: |
02.06.01.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.06)where Am Bn Xp, with (m+n):p=4:3 |
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(02.06.01)Dana Group |
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02.06.01.01 Dimorphite As4S3 P nma 2/m 2/m 2/m |
| Strunz Class: |
02.FA.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O |
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02.FA -With As, (Sb), S |
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02.FA.10 Dimorphite As4S3 P nma 2/m 2/m 2/m |
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Other Dimorphite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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
13 - WWW-MINCRYST
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Dimorphite
As4S3
Dana No: 02.06.01.01 Strunz No: 02.FA.10
Locality:
Notes:
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