Manganotantalite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Manganotantalite

Manganotantalite is an intense red to reddish brown variety of tantalite with a high manganese and low iron composition. Prized for its exceptional dispersion, this mineral yields beautiful faceted gemstones, thanks in large part to its orthorhombic crystal structure. However, faceted gems are very limited in availability.

Colors

Red

  • Manganotantalite classification

    CommonName
    Manganotantalite
    Species
    Manganotantalite
    Variety
    Colors
    Red
    AlternateNames
    Tantanlite-(Mn)
    GemstoneGroups
    KeySeparations
    OTL RI and high SG
    ClassificationComments
  • Manganotantalite chemistry & crystallography

    ChemicalName
    manganese tantalum oxide
    ChemicalFormula
    MnTa2O6
    Synthesis
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Oxide
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Manganotantalite optical properties

    Transparency
    Transparent
    Dispersion
    Strength: strong fire
    OpticalComments
    RefractiveIndex
    Over the Limit 2.19-2.34
    Birefringence
    0.015
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    Trichroic, strong red, brown, and orange
  • Manganotantalite characteristic physical properties

    Hardness
    5.5-6.5
    CharacteristicComments
    Streak
    Dark Red
    SpecificGravity
    7.73-7.97
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Uneven, Subconchoidal
    Cleavage
    Good, in two directions