Brazilianite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Brazilianite

Although this phosphate mineral has a hardness of 5.5, brazilianite is fragile due to its perfect cleavage and brittle nature. Most brazilianite is chartreuse to pale yellow and forms in granitic pegmatites associated with tourmaline and apatite.

Colors

Yellowish Green, Greenish Yellow, Rarely Colorless

  • Brazilianite classification

    CommonName
    Brazilianite
    Species
    Brazilianite
    Variety
    Colors
    Yellowish Green, Greenish Yellow, Rarely Colorless
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, birefringence, optic character
    ClassificationComments
  • Brazilianite chemistry & crystallography

    ChemicalName
    sodium aluminum phosphate hydroxide
    ChemicalFormula
    NaAl3(PO4)2(OH)4
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Phosphate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Brazilianite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.014
    OpticalComments
    RefractiveIndex
    1.602-1.621
    Tolerance:(+0.003/-0.003)
    Birefringence
    0.019-0.021
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Unobservable
  • Brazilianite characteristic physical properties

    Hardness
    5.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3-2.94 Typical:2.97
    Toughness
    Varies
    Inclusions
    Brazilianite stones are rarely eye-clean and typically have natural inclusions.
    Luster
    Vitreous
    Stability
    Poor
    Fracture
    Conchoidal
    Cleavage
    Perfect, in one direction