Realgar Mineral Data

Realgar Mineral Data +

General Realgar Information

Chemical Formula:

AsS

Composition:

Molecular Weight = 106.99 gm

Arsenic 70.03 % As

Sulfur 29.97 % S

______

100.00 %

Empirical Formula:

AsS

Environment:

Common low-temperature hydrothermal vein mineral associated with As-Sb minerals.

IMA Status:

Valid Species (Pre-IMA) 1747

Locality:

Zarshuran Mine, Azarbayjan-e Khavari, Takab (Takan Tepe), Iran. Link to MinDat.org Location Data.

Name Origin:

From the Arabic, rahj al ghar, "powder of the mine;"

Synonym:

ICSD 15238

PDF 41-1494

Realgar Image

Images:

Realgar Duranusite

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

Images:

Realgar

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

Images:

Realgar Rebulite

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

Images:

Realgar Vrbaite

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

Axial Ratios:

a:b:c =0.6866:1:0.4855

Cell Dimensions:

a = 9.29, b = 13.53, c = 6.57, Z = 16; beta = 106.883° V = 790.22 Den(Calc)= 3.60

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 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),

Forms:

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Crystal Structure:

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Mullen D J E , Nowacki W , Zeitschrift fur Kristallographie , 136 (1972) p.48-65, Refinement of the crystal structures of realgar, AsS and orpiment, As2S3, Locality: Lengenbach quarry, Binnatal, Switzerland

View Additional jPOWD Structure files for Realgar
[1]

Physical Properties of Realgar

Cleavage:

[010] Good

Color:

Aurora red, Orange yellow, Dark red.

Density:

3.56

Diaphaniety:

Transparent to translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

1.5-2 - Talc-Gypsum

Luminescence:

None.

Luster:

Sub Metallic

Streak:

orange

Optical Properties of Realgar

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.

Pleochroism (x):

dark red.

Pleochroism (y):

dark red.

Pleochroism (z):

orange red.

RL Anisotrophism:

Strong, in polished sections.

RL Color:

Gray white with abundant yellow to red internal reflections.

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**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	460%
R

Calculated Properties of Realgar

Electron Density:

r_electron=3.30 gm/cc
note: r_Realgar=3.60 gm/cc.

Fermion Index

Fermion Index = 0.00224
Boson Index = 0.99776

Photoelectric:

PE_Realgar= 51.07 barns/electron
U=PE_Realgar x r_electron= 168.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Realgar is Not Radioactive

Realgar Classification

Dana Class:

2.8.22.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.8.22)Dana Group

2.8.22.1 Realgar AsS P 2₁/n 2/m

2.8.22.2 Pararealgar AsS P 2₁/c 2/m

2.8.22.3 Uzonite As4S5 P 2₁/m 2/m

2.8.22.4 Alacranite As8S9 P 2/c 2/m

Strunz Class:

II/F.02-30 II - Sulfides and sulphosalts

II/F - Sulfides with nonmetallic properties, Arsenic-Sulfides

II/F.02 - Duranusite - Jeromite series

II/F.02-10 Duranusite As4S Unk Ortho

II/F.02-20 Dimorphite As4S3 P nma 2/m 2/m 2/m

II/F.02-30 Realgar AsS P 2₁/n 2/m

II/F.02-40 Pararealgar AsS P 2₁/c 2/m

II/F.02-50 Alacranite As8S9 P 2/c 2/m

II/F.02-60 Uzonite As4S5 P 2₁/m 2/m

II/F.02-70 Orpiment As2S3 P 2₁/n 2/m

II/F.02-80 Laphamite As2(Se,S)3 P 2₁/n 2/m

II/F.02-90 Jeromite As(S,Se)2 None

Other Realgar Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Realgar

AsS
Dana No: 2.8.22.1 Strunz No: II/F.02-30
Locality:

Notes: