Medusa Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™

Medusa Quartz

This unusual name refers to equally unusual inclusions within this crystal. Medusa quartz is host to beautiful radial tufts of blue to green gilalite. The umbrella-like formations were named for their uncanny resemblance to the medusa jellyfish.

Colors

Colorless With Green, Blue-Green Inclusions

  • Medusa-quartz classification

    CommonName
    Medusa Quartz
    Species
    Quartz
    Variety
    Medusa Quartz
    Colors
    Colorless With Green, Blue-Green Inclusions
    AlternateNames
    Gilalite In Quartz
    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
    Medusa quartz gets its name because the gilalite inclusions look like the Medusas Rondeau jellyfish.
  • Medusa-quartz chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Medusa-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
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Medusa-quartz characteristic physical properties

    Hardness
    7
    CharacteristicComments
    Streak
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Medusa quartz will contain gilalite 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