Pyrope-Spessartite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Pyrope-Spessartite

Discovered in the mid 1960's in Tanzania's Umba Valley, this red-orange to pink-orange variety of garnet was originally thought to be spessartite garnet. Actually a mixture of pyrope and spessartite garnets, these gems are lively thanks to their sparkling red flashes. Once discovered not to be spessartite, they aptly became known by the Swahili word malaia, meaning "out of the family".

Colors

Light To Dark, Slightly Pinkish Orange, Reddish Orange, Yellowish Orange, Blue, Teal, Greenish Blue, Pink, Red, Purple

  • Pyrope-spessartite classification

    CommonName
    Pyrope-Spessartite
    Species
    Pyrope-Spessartite
    Variety
    Colors
    Light To Dark, Slightly Pinkish Orange, Reddish Orange, Yellowish Orange, Blue, Teal, Greenish Blue, Pink, Red, Purple
    AlternateNames
    Umbalite, Malaya, Malaia And Color-Change
    GemstoneGroups
    Garnet
    KeySeparations
    RI, SR nature, magnification, and possibly spectrum. Lack of pleochroism makes clear separation from alexandrite.
    ClassificationComments
    Malaia garnet comes from the Umba Valley in Tanzania and are yellowish-brown, brownish pink, cinnamon color, honey brown, reddish brown to brown-orange.Umbalite garnet comes from the Umba Valley in Tanzania and are light pink to purple.Color change garnets are generally intense pink to red under incandescent light and greenish yellow in daylight or fluorescent light or teal to purple color change.
  • Pyrope-spessartite chemistry & crystallography

    ChemicalName
    magnesium aluminium garnet or manganese aluminium garnet
    ChemicalFormula
    Mg3Al2(SiO4)3-Mn32+Al2(SiO4)3
    Synthesis
    CrystalSystem
    Cubic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Pyrope-spessartite optical properties

    Transparency
    Transparent
    Dispersion
    Strength: moderate fire Value: 0.022
    OpticalComments
    RefractiveIndex
    1.75-1.78
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Pyrope-spessartite characteristic physical properties

    Hardness
    7-7.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.78-3.85
    Toughness
    Good
    Inclusions
    Pyrope-spessartite is a type II clarity stone. Stones sometimes contains rutile, apatite and pyrite mineral inclusions and intersecting needles.
    Luster
    SubAdamantine
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    None