Bloodstone Gemstone & Information | Gemopedia by JTV | Gemopedia™

Bloodstone

Bloodstone is green jasper dotted with bright red spots of iron oxide. The green color is caused by small particles of chlorite, a silicate mineral or hornblende needles interspersed throughout the host material. Its distinctive reddish spots are caused by the presence of iron oxides.

Colors

Green With Red, Brownish Spots

  • Bloodstone classification

    CommonName
    Bloodstone
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Green With Red, Brownish Spots
    AlternateNames
    Heliotrope
    GemstoneGroups
    KeySeparations
    RI, SG, appearance and fracture
    ClassificationComments
    Green color caused by chlorite and hornblende and the red is caused by iron oxide. Misnomers: blood jasper
  • Bloodstone chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Polycrystalline
    ChemistryComments
  • Bloodstone optical properties

    Transparency
    Semitranslucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.535-1.539
    Birefringence
    0.004-0.004
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Bloodstone characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.55-2.7 Typical:2.6
    Toughness
    Excellent
    Inclusions
    Bloodstone is dark green with red or brown spots. Appearance is what separates bloodstone from other chalcedonies.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Granular
    Cleavage
    None