Richterite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Richterite

Richterite, named after a famous German chemist and co-discoverer of the element indium, is member of the amphibole group of minerals. Typically, richterite is near colorless to brown, however, if richterite is dominantly composed of potassium, it can be blue. In South Africa, it is associated with another blue mineral of similar chemical composition, sugilite.

Colors

Brown, Yellow, Dark Red, Dark Green, Blue, Gray, Violet

  • Richterite classification

    CommonName
    Richterite
    Species
    Richterite
    Variety
    Richterite
    Colors
    Brown, Yellow, Dark Red, Dark Green, Blue, Gray, Violet
    AlternateNames
    GemstoneGroups
    Amphibole
    KeySeparations
    ClassificationComments
  • Richterite chemistry & crystallography

    ChemicalName
    sodium calcium magnesium iron silicate hydroxide
    ChemicalFormula
    Na2Ca(Mg, Fe, Al)5(Si, Al)8O22(OH,F)2
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Richterite optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: strong fire
    OpticalComments
    RefractiveIndex
    1.605-1.712
    Birefringence
    0.021
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    Trichroic, strong, varying shades of body color
  • Richterite characteristic physical properties

    Hardness
    5-6
    CharacteristicComments
    Streak
    Gray
    SpecificGravity
    2.97-3.45 Typical:3.1
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    Perfect, in one direction