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![Mineralogy Database Mineralogy Database](/images/Hedyphane_Crystal.gif) |
Pararealgar Mineral Data
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General Pararealgar Information
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Chemical Formula: |
AsS |
Composition: |
Molecular Weight = 106.99 gm |
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Arsenic 70.03 % As |
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Sulfur 29.97 % S |
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______ |
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100.00 % |
Empirical Formula: |
AsS |
Environment: |
As an alteration product of reagar in stibnite-bearing quartz veins. |
IMA Status: |
Approved IMA 1980 |
Locality: |
Mount Washington copper deposit, Vancouver Island, British Columbia, Canada. Link to MinDat.org Location Data. |
Name Origin: |
Named for its chemical identity with realgar. |
Name Pronunciation: |
Pararealgar + Pronunciation |
Synonym: |
ICSD 80124 |
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IMA1980-034 |
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PDF 33-127 |
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Pararealgar Image |
Images:
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Pararealgar Crystallography
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Axial Ratios: |
a:b:c =1.0263:1:0.8805 |
Cell Dimensions: |
a = 9.909, b = 9.655, c = 8.502, Z = 16; beta = 97.29° V = 806.82 Den(Calc)= 3.52 |
Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c |
X Ray Diffraction: |
By Intensity(I/Io): 5.14(1), 5.56(0.91), 3.75(0.78), |
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Physical Properties of Pararealgar
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Cleavage: |
None |
Color: |
Light yellow, Orange brown, Orange. |
Density: |
3.52 |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Powdery - Forms a loose, poorly-coherent pulverulent mass. |
Hardness: |
1-1.5 - Talc or a little harder |
Luster: |
Vitreous - Resinous |
Streak: |
light yellow |
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Optical Properties of Pararealgar
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Optical Data: |
Biaxial (?), b=2.02 |
Pleochroism (x): |
orange yellow. |
Pleochroism (y): |
bright yellow. |
Pleochroism (z): |
orange red. |
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Calculated Properties of Pararealgar
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Electron Density: |
Bulk Density (Electron Density)=3.22 gm/cc note: Specific Gravity of Pararealgar =3.52 gm/cc. |
Fermion Index: |
Fermion Index = 0.0022478773 Boson Index = 0.9977521227 |
Photoelectric: |
PEPararealgar = 51.07 barns/electron U=PEPararealgar x rElectron Density= 164.67 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pararealgar is Not Radioactive |
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Pararealgar Classification
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Dana Class: |
02.08.22.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.08)where Am Bn Xp, with (m+n):p=1:1 |
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(02.08.22)Realgar Series |
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02.08.22.01 Realgar AsS P 21/n 2/m |
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02.08.22.02 Pararealgar AsS P 21/c 2/m |
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02.08.22.03 Uzonite As4S5 P 21/m 2/m |
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02.08.22.04 Alacranite As8S9 P 2/c 2/m |
Strunz Class: |
02.FA.15b 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.15b Pararealgar AsS P 21/c 2/m |
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Other Pararealgar Information
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References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Pararealgar :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Pararealgar
AsS
Dana No: 02.08.22.02 Strunz No: 02.FA.15b
Locality:
Notes:
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