Celestite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Celestite

Celestite, also called celestine, is named for the Latin coelestis, meaning "heavenly," in reference to its often sky-blue color. This unique gem often forms beautiful transparent to blue tabular crystals, but it can also be colorless, white, light red, green, blue or brown.

Colors

Light Blue, Orange, Brown, Yellow, Green

  • Celestite classification

    CommonName
    Celestite
    Species
    Celestite
    Variety
    Colors
    Light Blue, Orange, Brown, Yellow, Green
    AlternateNames
    Celestine
    GemstoneGroups
    KeySeparations
    RI, birefringence and optic character
    ClassificationComments
    Some celestite might lose color upon heating or exposure to sunlight.
  • Celestite chemistry & crystallography

    ChemicalName
    strontium sulfate
    ChemicalFormula
    SrSO4
    Synthesis
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Sulfate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Celestite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.619-1.635
    Birefringence
    0.01-0.012
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to weak display same as bodycolorMight phosphoresce
    LWUV: Inert to weak display same as bodycolorMight phosphoresce
    CCFReaction
    Pleochroism
    Trichroic, unobservable or weak, varying shades of body color
  • Celestite characteristic physical properties

    Hardness
    3-3.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.97-4
    Toughness
    Poor
    Inclusions
    Celestite is a rare mineral that can contain liquid inclusions and partially healed fractures.
    Luster
    Vitreous
    Stability
    Fracture
    Uneven
    Cleavage
    Perfect, in one direction, Good, in one direction, Poor, in one direction