Hemimorphite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Hemimorphite

Found in several worldwide locations that are often zinc-rich environments, most hemimorphite crystals are white to grayish white, yellowish or totally colorless. But when the robin's egg blue hues are found, miners know they have hit a pocket of true gem-quality material. Not only is fine quality hemimorphite geologically scarce, but there are few locations that have the right combination of trace minerals that create this stunning blue color. This gem is often appreciated as natural specimens due to its almost bubbly botryoidal crystal habit.

Colors

Blue, Bluish Gray ,Colorless, White, Gray, Yellow, Green, Pink, Purple, and Brown, sometimes Banded

  • Hemimorphite classification

    CommonName
    Hemimorphite
    Species
    Hemimorphite
    Variety
    Colors
    Blue, Bluish Gray ,Colorless, White, Gray, Yellow, Green, Pink, Purple, and Brown, sometimes Banded
    AlternateNames
    Calamine
    GemstoneGroups
    KeySeparations
    SG, RI, birefringence, optic character and sign
    ClassificationComments
  • Hemimorphite chemistry & crystallography

    ChemicalName
    hydrated zinc silicate hydroxide
    ChemicalFormula
    Zn4Si2O7(OH)2.H2O
    Synthesis
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Hemimorphite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: moderate fire Value: 0.02
    OpticalComments
    RefractiveIndex
    1.614-1.636
    Tolerance:(+0.003/-0.003)
    Birefringence
    0.022
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Unobservable
  • Hemimorphite characteristic physical properties

    Hardness
    4.5-5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.3-3.5 Typical:3.45
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Uneven, Subconchoidal
    Cleavage
    Perfect, in one direction, Good, in one direction