Clinohumite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Clinohumite

A relatively new addition to the world of gems, clinohumite was first discovered in 1876 within stones erupted from Mount Vesuvius. Only recently have gem-quality pieces been found in locales including Tajikistan's Pamir Mountains. Clinohumite's coloring typically ranges from bright yellow to deep orange to red, but a few brown specimens have been found.

Colors

Bright Yellow, Yellow Brown, Orange, Brownish Orange To Red Brown

  • Clinohumite classification

    CommonName
    Clinohumite
    Species
    Clinohumite
    Variety
    Colors
    Bright Yellow, Yellow Brown, Orange, Brownish Orange To Red Brown
    AlternateNames
    Humite
    GemstoneGroups
    KeySeparations
    RI and birefringence
    ClassificationComments
  • Clinohumite chemistry & crystallography

    ChemicalName
    ChemicalFormula
    (Mg, Fe2+)9(SiO4)4(F,OH))2
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Clinohumite optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: moderate fire Value: 0.021
    OpticalComments
    RefractiveIndex
    1.629-1.674
    Birefringence
    0.028-0.041
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: orange-yellow
    LWUV: Inert
    CCFReaction
    Pleochroism
    Trichroic, brownish orange, orangy yellow, and colorless to yellow
  • Clinohumite characteristic physical properties

    Hardness
    6
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.13-3.75
    Toughness
    Poor
    Inclusions
    Clinohumite might have fingerprints, euhedral crystals and color zoning.
    Luster
    Vitreous
    Stability
    Fracture
    Subconchoidal
    Cleavage
    Poor, in one direction