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Arsenopyrite Mineral Data

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General Arsenopyrite Information

Chemical Formula:

FeAsS

Composition:

Molecular Weight = 162.83 gm

Empirical Formula:

Fe³⁺AsS

Environment:

High temperature veins. Found in igneous pegmatites and contact metamorphic rocks.

IMA Status:

Valid Species (Pre-IMA) 1847

Locality:

Most common arsenic-bearing mineral found world wide. Link to MinDat.org Location Data.

Name Origin:

Named after the minerals chemical composition.

Name Pronunciation:

Arsenopyrite + Pronunciation

Synonym:

Arsenical pyrite

Bismuthian Arsenopyrite

Cobaltian Arsenopyrite

ICSD 62400

Mispickel

PDF 42-1320

Arsenopyrite Image

Images:

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Arsenopyrite Siderite

Images:

Arsenopyrite

Arsenopyrite Crystallography

Axial Ratios:

a:b:c =1.0105:1:1.0193

Cell Dimensions:

a = 5.74, b = 5.68, c = 5.79, Z = 4; beta = 112.17° V = 174.82 Den(Calc)= 6.19

Crystal System:

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

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

By Intensity(I/I_o):2.662(1), 2.677(1), 2.418(0.95),

Forms:

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Forms:

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Crystal Structure:

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Morimoto N , Clark L A , American Mineralogist , 46 (1961) p.1448-1469, Arsenopyrite crystal-chemical relations, From Freiberg, Germany

Physical Properties of Arsenopyrite

Cleavage:

{110} Distinct

Color:

Tin white, Light steel gray.

Density:

6.07

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

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

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Magnetic after heating

Streak:

black

Optical Properties of Arsenopyrite

RL Anisotrophism:

Strong, red-violet.

RL Color:

White, faint yellow tint.

RL Pleochroism:

Weak, white with bluish tint to faint reddish yell.

Reflectivity

Calculated Properties of Arsenopyrite

Electron Density:

Bulk Density (Electron Density)=5.70 gm/cc
note: Specific Gravity of Arsenopyrite =6.19 gm/cc.

Fermion Index:

Fermion Index = 0.0087478423
Boson Index = 0.9912521577

Photoelectric:

PE_Arsenopyrite= 44.13 barns/electron
U=PE_Arsenopyrite x Electron Density= 251.61 barns/cc.

Radioactivity:

GRapi = 0(Gamma Ray American Petroleum Institute Units)
Arsenopyrite isNot Radioactive

Arsenopyrite Classification

Dana Class:

02.12.04.01(02)Sulfides - Including Selenides and Tellurides

(02.12)where Am Bn Xp, with (m+n):p=1:2

(02.12.04)Arsenopyrite Group (Monoclinic: P21/c (Pseudo-orthorhombic))

Strunz Class:

02.EB.2002 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

Other Arsenopyrite Information

References:

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

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