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Geosciences LibreTexts

16.69: Turquoise

  • Page ID
    6499
  •  

    Turquoise
    Chemical composition CuAl6(PO4)4(OH)8.5H2O
    Crystal system Triclinic
    Habit Botryoidal, massive, microcrystalline to granular
    Fracture Conchoidal
    Hardness 5.0 - 6.0
    Refractive index 1.610-1.650
    Specific gravity 2.30-2.90
    Lustre Waxy

    Figure \(\PageIndex{1}\): Persian turquoise