Mineralogy Database

Realgar Mineral Data

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General Realgar Information

Help on Chemical  Formula: Chemical Formula: AsS
Help on Composition: Composition: Molecular Weight = 106.99 gm
   Arsenic  70.03 %  As
   Sulfur   29.97 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: AsS
Help on Environment: Environment: Common low-temperature hydrothermal vein mineral associated with As-Sb minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1747
Help on Locality: Locality: Zarshuran Mine, Azarbayjan-e Khavari, Takab (Takan Tepe), Iran. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Arabic, rahj al ghar, "powder of the mine;"
Help on Name Pronunciation: Name Pronunciation: Realgar Say REALGAR
Help on Synonym: Synonym: ICSD 15238
  PDF 41-1494

Realgar Image

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  Duranusite   Realgar

Comments: Small black Duranusite in orange-red realgar matrix.
Location: Duranus, Alpes-Maritimes, Provence-Alpes-CÃīte d'Azur, France. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

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Comments: Sharp, dark red crystals of realgar to 2 cm on calcite.
Location: Hunan Province, Chin. Scale: Crystal size 2 cm.
© John Attard

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  Rebulite   Realgar

Comments: Dark gray rebulite grain in red, massive realgar.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

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  Vrbaite   Realgar

Comments: Black grain of vrbaite in red realgar matrix.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag

Realgar Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6866:1:0.4855
Help on Cell Dimensions: Cell Dimensions: a = 9.29, b = 13.53, c = 6.57, Z = 16; beta = 106.883° V = 790.22 Den(Calc)= 3.60
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.4(1), 3.19(0.9), 2.73(0.8),2.94(0.8), 1.859(0.6), 2.14(0.5), 2.49(0.5),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 2 0) ( 1 1 1) ( 0 1 1) ( 1 0 1) ( 1 1 0) ( 0 0 1)

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Physical Properties of Realgar

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Aurora red, Orange yellow, Dark red.
Help on Density: Density: 3.56
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: orange

Optical Properties of Realgar

Help on Optical Data: Optical Data: Biaxial (-), a=2.538, b=2.684, g=2.704, bire=0.1660, 2V(Calc)=38, 2V(Meas)=40. Dispersion r > v very strong.
Help on Pleochroism (x): Pleochroism (x): dark red.
Help on Pleochroism (y): Pleochroism (y): dark red.
Help on Pleochroism (z): Pleochroism (z): orange red.
Help on RL Anisotrophism: RL Anisotrophism: Strong, in polished sections.
Help on RL Color: RL Color: Gray white with abundant yellow to red internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Realgar in Air
λ R  ∑ R(λ) 
 400 nm   23.30   
 420 nm   23.00 
 440 nm   22.70 
 460 nm   22.30 
 480 nm   21.80 
 500 nm   21.20 
 520 nm   20.60 
 540 nm   20.10 
 560 nm   19.70 
 580 nm   19.40 
 600 nm   19.10 
 620 nm   19.00 
 640 nm   18.80 
 660 nm   18.60 
 680 nm   18.50 
 700 nm   18.40 
Calculated Relative Intensity Colors of Realgar in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 460%

Calculated Properties of Realgar

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Realgar =3.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0022478773
Boson Index = 0.9977521227
Help on Photoelectric: Photoelectric: PERealgar = 51.07 barns/electron
U=PERealgar x rElectron Density= 168.41 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Realgar is Not Radioactive

Realgar Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.08)where Am Bn Xp, with (m+n):p=1:1
  (02.08.22)Realgar Series Realgar AsS P 21/n 2/m Pararealgar AsS P 21/c 2/m Uzonite As4S5 P 21/m 2/m Alacranite As8S9 P 2/c 2/m
Help on  Strunz Class: Strunz Class: 02.FA.15a 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.15a Realgar AsS P 21/n 2/m

Other Realgar Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Realgar :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Glendale Community College
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - Philatelic Mineralogy
17 - QUT Mineral Atlas
18 - Ruff.Info

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Dana No: Strunz No: 02.FA.15a





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