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

Cleavelandite In Quartz

This white lamellar variety of albite forms extremely thin, platy crystals that are only fractions of millimeters to a few millimeters thick. Cleavelandite was named in honor of 19th century American professor of geology and mineralogy, Parker Cleaveland.

Colors

Colorless With Inclusions That Are White To Gray, Bluish, Greenish, Reddish

  • Cleavelandite-in-quartz classification

    CommonName
    Cleavelandite In Quartz
    Species
    Quartz
    Variety
    Colors
    Colorless With Inclusions That Are White To Gray, Bluish, Greenish, Reddish
    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
  • Cleavelandite-in-quartz chemistry & crystallography

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

    Hardness
    7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Cleaveandite in quartz will have cleaveandite inclusions and may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile, iron particles. The cleaveandite inclusions are typically round and white with snowball like appearance.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    None