Chrysocolla-In-Chalcedony Gemstone & Information | Gemopedia by JTV | Gemopedia™

Chrysocolla-In-Chalcedony

Chrysocolla forms as a decomposition product of copper minerals and frequently is intergrown with other minerals, in this case, with chalcedony. Also referred to as "gem silica," it is one of the rarest and most treasured variety of chalcedony. The gem may be seen in blue to blue-green color, and may be opaque to almost transparent.

Colors

Blue To Green-Blue

  • Chrysocolla-in-chalcedony classification

    CommonName
    Chrysocolla-In-Chalcedony
    Species
    Chrysocolla, Quartz
    Variety
    Chrysocolla-In-Chalcedony
    Colors
    Blue To Green-Blue
    AlternateNames
    Chrysocolla Quartz, Cuprian Chalcedony, Gem Silica
    GemstoneGroups
    KeySeparations
    RI, SG, appearance and fracture
    ClassificationComments
    Might be unevenly colored and might be mistaken for turquoise. Colored by copper mineral chrysocolla or copper salts.
  • Chrysocolla-in-chalcedony chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Polycrystalline
    ChemistryComments
  • Chrysocolla-in-chalcedony optical properties

    Transparency
    Translucent - Semitranslucent
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.535-1.539
    Birefringence
    0.004-0.004
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Unobservable
  • Chrysocolla-in-chalcedony characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    SpecificGravity
    2.55-2.7 Typical:2.6
    Toughness
    Excellent
    Inclusions
    Chrysocolla-in-chalcedony might be unevenly colored.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Granular
    Cleavage
    None