Marcasite | Gemopedia

Marcasite is a polymorph of pyrite. It has the same chemistry, but a different crystal structure. In the jewelry trade, the names pyrite and marcasite are often used interchangeably. Marcasite is often cut and polished in a cone or pyramid shape and pav set between sterling silver beads to enhance their brilliance.
Colors
Metallic Yellow/Brassy

Marcasite Classification

Common Name

Marcasite

Species

Marcasite

Variety

Colors

Metallic Yellow/Brassy

Alternate Names

Gemstone Groups

Key Separations

SG more brittle than pyrite

Comments

Marcasite is a polymorph of pyrite. Always wash your hands after handling the stone.

Marcasite Optical Properties

Transparency

Transparent - Semitransparent

Refractive Index

1.81-0

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Fluorescence

SWUV: None
LWUV: None

CCF Reaction

Pleochroism

None

Dispersion

Comments

Marcasite Chemistry & Crystallography

Chemical Name

iron sulfide

Chemical Formula

FeS2

Synthesis

Crystal System

Orthorhombic

Classification

Sulfide

Nature

Natural

Crystallinity

Crystalline

Comments

Marcasite Characteristic Physical Properties

Hardness

6-6.5

Streak

Greenish Black

Specific Gravity

4.85-4.92 Typical:4.887

Toughness

Poor

Inclusions

Luster

Metallic

Stability

Fracture

Uneven

Cleavage

Good, in one direction

Comments

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