Pyrite | Gemopedia

Pyrite has a shiny golden-yellow color and a metallic luster. Its name comes from the Greek word pyr, meaning "a gemstone that strikes fire," due to the sparks produced when pyrite strikes iron. While pyrite has a history of being mistaken for gold, they are differentiated by pyrite's lighter, tougher, broken-faced grains. You may hear pyrite called by its nickname 'fool's gold,' or its jewelry trade name, "marcasite."
Colors
Metallic Yellow/Brassy

Pyrite Classification

Common Name

Pyrite

Species

Pyrite

Variety

Colors

Metallic Yellow/Brassy

Alternate Names

Gemstone Groups

Key Separations

Appearance and SG, non-magnetic

Comments

Misnomers: fool's gold, marcasite

Pyrite Optical Properties

Transparency

Opaque

Refractive Index

1.81-0

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Comments

Pyrite Chemistry & Crystallography

Chemical Name

iron sulfide

Chemical Formula

FeS2

Synthesis

Crystal System

Cubic

Classification

Sulfide

Nature

Natural

Crystallinity

Crystalline

Comments

Pyrite Characteristic Physical Properties

Hardness

6-6.5

Streak

Greenish To Brownish Black Streak

Specific Gravity

4.9-5.1 Typical:5

Toughness

Good

Inclusions

Luster

Metallic

Stability

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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