Pararealgar Mineral Data

General Pararealgar Information

Chemical Formula:

AsS

Composition:

Molecular Weight = 106.99 gm

Arsenic 70.03 % As

Sulfur 29.97 % S

______

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

IMA1980-034

PDF 33-127

Pararealgar Image

Images:

Pararealgar

Comments: Orange pararealgar on matrix.
Location: Hänichen, Dresden, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Pararealgar Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.14(1), 5.56(0.91), 3.75(0.78),

Physical Properties of Pararealgar

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

Optical Properties of Pararealgar

Optical Data:

Biaxial (?), b=2.02

Pleochroism (x):

orange yellow.

Pleochroism (y):

bright yellow.

Pleochroism (z):

orange red.

Calculated Properties of Pararealgar

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:

PE_Pararealgar= 51.07 barns/electron
U=PE_Pararealgar x rElectron Density= 164.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pararealgar is Not Radioactive

Pararealgar Classification

Dana Class:

02.08.22.02 (02)Sulfides - Including Selenides and Tellurides

(02.08)where Am Bn Xp, with (m+n):p=1:1

(02.08.22)Realgar Series

02.08.22.01 Realgar AsS P 2₁/n 2/m

02.08.22.02 Pararealgar AsS P 2₁/c 2/m

02.08.22.03 Uzonite As4S5 P 2₁/m 2/m

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

02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O

02.FA -With As, (Sb), S

02.FA.15b Pararealgar AsS P 2₁/c 2/m

Other Pararealgar Information

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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Print or Cut-and-Paste your Pararealgar Specimen Label here :

Pararealgar

AsS
Dana No: 02.08.22.02 Strunz No: 02.FA.15b
Locality:

Notes:

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