Arsenic Mineral Data

Arsenic Mineral Data +

General Arsenic Information

Chemical Formula:

Composition:

Molecular Weight = 74.92 gm

Arsenic 100.00 % As

______

100.00 %

Empirical Formula:

Environment:

In ore veins in crystalline rocks.

IMA Status:

Valid Species (Pre-IMA) Prehistoric

Locality:

Saxony, Great Britain. Link to MinDat.org Location Data.

Name Origin:

From the Greek, Arsenikon, a name originally applied to the mineral orpiment.

Synonym:

ICSD 16516

PDF 5-632

Arsenic Image

Images:

Arsenic

Comments: Bright, metallic, gray, crystalline aggregate or arsenic.
Location: Niederschlema, Saxony, Germany. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Arsenic

Comments: Botryoidal-concentric aggregate of arsenic with white calcite crystals.
Location: Schneeberg, Erzgebirge, Sachsen, Germany. Scale: 7 x 4 cm.
© Thomas Witzke / Abraxas-Verlag

Images:

Arsenic Claudetite

Comments: Colorless prismatic crystal of claudetite on native arsenic.
Location: J?chymov (St Joachimsthal), Krusn? Hory (Erzgebirge), Z?padocesk? Kraj, Bohemia, Czech Republic. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Arsenic Crystallography

Axial Ratios:

a:c = 1:2.80626

Cell Dimensions:

a = 3.768, c = 10.574, Z = 6; V = 130.01 Den(Calc)= 5.74

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.771(1), 1.879(0.26), 3.52(0.26),

Forms:

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Forms: [ 1 0 4] [ 0 2 1] [ 0 1 2] [ 0 0 1]

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Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York

View Additional jPOWD Structure files for Arsenic
[1] [2] [3]

Physical Properties of Arsenic

Cleavage:

[0001] Perfect

Color:

Lead gray, Gray, White.

Density:

5.7

Diaphaniety:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

3.5 - Copper Penny

Luminescence:

None.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

black

Optical Properties of Arsenic

RL Anisotrophism:

Distinct, yellow brown and light gray to yellowish gray.

RL Pleochroism:

Feeble.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Arsenic in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	53.90	58.40
420 nm	52.20	57.00
440 nm	50.50	55.60
460 nm	49.60	54.70
480 nm	48.90	54.20
500 nm	48.30	53.80
520 nm	47.80	53.40
540 nm	47.40	53.20
560 nm	47.20	52.90
580 nm	47.00	52.80
600 nm	46.90	52.70
620 nm	46.60	52.60
640 nm	46.40	52.60
660 nm	46.30	52.60
680 nm	46.40	52.70
700 nm	47.00	52.80

**Calculated Relative Intensity Colors of Arsenic in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Arsenic

Electron Density:

r_electron=5.06 gm/cc
note: r_Arsenic=5.74 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Arsenic= 73.21 barns/electron
U=PE_Arsenic x r_electron= 370.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Arsenic is Not Radioactive

Arsenic Classification

Dana Class:

1.3.1.1 (1)Native Elements

(1.3)with semi-metallic and non-metallic elements

(1.3.1)Arsenic group

1.3.1.1 Arsenic As R 3m 3 2/m

1.3.1.2 Antimony Sb R 3m 3 2/m

1.3.1.3 Stibarsen SbAs R 3m 3 2/m

1.3.1.4 Bismuth Bi R 3m 3 2/m

1.3.1.5 Stistaite SnSb R 3m 3 2/m

Strunz Class:

I/B.01-10 I - Elements

I/B - Semimetals and nonmetals

I/B.01 - Arsenic-Bismuth series

I/B.01-10 Arsenic As R 3m 3 2/m

I/B.01-20 Stibarsen SbAs R 3m 3 2/m

I/B.01-30 Antimony Sb R 3m 3 2/m

I/B.01-40 Bismuth Bi R 3m 3 2/m

I/B.01-50 Arsenolamprite As Bmab 2/m 2/m 2/m

I/B.01-55 Pararsenolamprite! As Pmn2 or P 2₁nm Ortho

I/B.01-60 Paradocrasite Sb2(Sb,As)2 C 2 2

Other Arsenic Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Arsenic

As
Dana No: 1.3.1.1 Strunz No: I/B.01-10
Locality:

Notes: