Cuprite | Gemopedia

Cuprite is a secondary mineral formed by the oxidation of copper sulfide veins. It is commonly found with native copper and malachite, and forms as both transparent red and lustrous, submetallic crystals. Transparent crystals may be faceted if large enough, but specimens are also commonly displayed as a glittering bed of crystals.
Colors
Dark Purplish Red To Brownish Red To Almost Black

Cuprite Classification

Common Name

Cuprite

Species

Cuprite

Variety

Colors

Dark Purplish Red To Brownish Red To Almost Black

Alternate Names

Gemstone Groups

Key Separations

appearance, color, SG, SR nature, spectrum

Comments

Surface might show signs of tarnish

Cuprite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

2.849-0
Tolerance:(+0.001/-0.0010

Birefringence

Optic Character

NA

Optic Sign

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: inert
LWUV: inert

CCF Reaction

Pleochroism

None

Dispersion

Comments

Cuprite Chemistry & Crystallography

Chemical Name

Chemical Formula

Cu2O

Synthesis

Crystal System

Cubic

Classification

Nature

Natural

Crystallinity

Crystalline

Comments

Cuprite Characteristic Physical Properties

Hardness

3.5-4

Streak

Brownish Red

Specific Gravity

6.15-5.85 Typical:6.14

Toughness

Poor

Inclusions

Luster

SubAdamantine

Stability

Fracture

Conchoidal, Uneven

Cleavage

Poor, in two directions

Comments

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