Tremolite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Tremolite

Deriving its name from a locality in the Swiss Alps, tremolite is a member of the amphibole group, a complex series of silicate minerals. It forms in thin, parallel fibers, sometimes producing a distinct cat's eye effect when cut in cabochons. Tremolite comes in a variety of colors ranging from white, brown, colorless, gray, light green, light yellow and pink-violet. This gem sometimes occurs as fine, needle-like inclusions in emerald and quartz.

Colors

Gray, Green, Brown, Yellow, Lavender To Pink, White, Colorless

  • Tremolite classification

    CommonName
    Tremolite
    Species
    Tremolite
    Variety
    Colors
    Gray, Green, Brown, Yellow, Lavender To Pink, White, Colorless
    AlternateNames
    Chrome-Tremolite, Hexagonite, Grammatite
    GemstoneGroups
    KeySeparations
    ClassificationComments
    Chrome-tremolite is the green variety of tremolite colored by chrome. Hexagonite is the transparent pink to lilac pink variety of tremolite. Stones can be chatoyant.
  • Tremolite chemistry & crystallography

    ChemicalName
    calcium magnesium iron silicate
    ChemicalFormula
    Ca2Mg5Si8O22(OH)2
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Tremolite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire
    OpticalComments
    RefractiveIndex
    1.56-1.643
    Birefringence
    0.017-0.027
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to moderate orange to yellow
    LWUV: Inert to moderate orange or pink
    CCFReaction
    Pleochroism
    Unobservable
  • Tremolite characteristic physical properties

    Hardness
    5-6
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.95-3.07
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Uneven
    Cleavage
    Perfect, in one direction