Cuprite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Cuprite

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

    CommonName
    Cuprite
    Species
    Cuprite
    Variety
    Colors
    Dark Purplish Red To Brownish Red To Almost Black
    AlternateNames
    GemstoneGroups
    KeySeparations
    appearance, color, SG, SR nature, spectrum
    ClassificationComments
    Surface might show signs of tarnish
  • Cuprite chemistry & crystallography

    ChemicalName
    ChemicalFormula
    Cu2O
    Synthesis
    CrystalSystem
    Cubic
    ChemistryClassification
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Cuprite optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    2.849-0
    Tolerance:(+0.001/-0.0010
    Birefringence
    OpticCharacter
    NA
    OpticSign
    PolariscopeReaction
    Singly Refractive (SR)
    Fluorescence
    SWUV: inert
    LWUV: inert
    CCFReaction
    Pleochroism
    None
  • Cuprite characteristic physical properties

    Hardness
    3.5-4
    CharacteristicComments
    Streak
    Brownish Red
    SpecificGravity
    6.15-5.85 Typical:6.14
    Toughness
    Poor
    Inclusions
    Luster
    SubAdamantine
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    Poor, in two directions