Covellite In Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™

Covellite In Quartz

The mineral covellite, typically indigo blue to dark blue in color, often displays iridescence that is purplish to deep red. When present in quartz, it exhibits a glittering appearance not soon forgotten. Covellite was named in honor of Niccolo Covelli, an Italian mineralogist who discovered the mineral at Mount Vesuvius.

Colors

Colorless With Metallic Blue, Blue-Black Sometimes With Iridescence

  • Covellite-in-quartz classification

    CommonName
    Covellite In Quartz
    Species
    Quartz
    Variety
    Covellite In Quartz
    Colors
    Colorless With Metallic Blue, Blue-Black Sometimes With Iridescence
    AlternateNames
    GemstoneGroups
    KeySeparations
    Refractive index, appearance, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz; may also show Airy's spiral optic figure and Brazil-law twinning under crossed polarizing filters.
    ClassificationComments
  • Covellite-in-quartz chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Tetragonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Covellite-in-quartz optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.013
    OpticalComments
    RefractiveIndex
    1.544-1.553
    Tolerance:very constant
    Birefringence
    0.009
    OpticCharacter
    OpticSign
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Covellite-in-quartz characteristic physical properties

    Hardness
    7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Covellite in quartz will have covellite inclusions and may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile and iron particles.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    None