Arsenopyrite | Gemopedia

Arsenopyrite is the most common arsenic mineral and gets its name from the combination of its former name: aresenical pyrites. Its color is silver-white to steel-gray on freshly broken surfaces. It yields a garlic odor when heated and the fumes can be toxic. It may tarnish to form an iridescent layer. Although arsenic has a reputation for being poisonous to humans, complex compounds are actually used in the treatment of disease caused by microorganisms.
Alternate
Names
Mispickel
Colors
Slivery White To Steel Gray White Faint White, Yellow Tint

Arsenopyrite Classification

Common Name

Arsenopyrite

Species

Arsenopyrite

Variety

Colors

Slivery White To Steel Gray White Faint White, Yellow Tint

Alternate Names

Mispickel

Gemstone Groups

Key Separations

Comments

This stone contains arsenic and special care needs to be used. Always wash your hands after handling.

Arsenopyrite Optical Properties

Transparency

Opaque

Refractive Index

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Arsenopyrite Chemistry & Crystallography

Chemical Name

iron arsenide sulfide

Chemical Formula

FeAsS

Synthesis

Crystal System

Monoclinic

Classification

Sulfide

Nature

Natural

Crystallinity

Crystalline

Comments

Arsenopyrite Characteristic Physical Properties

Hardness

5.5-6

Streak

Gray To Black

Specific Gravity

5.9-6.2

Toughness

Poor

Inclusions

Luster

Metallic

Stability

Poor

Fracture

Uneven

Cleavage

Good, in one direction

Comments

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