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Geosciences LibreTexts

16.33: Dioptase

  • Page ID
    4717
  •  

    Dioptase
    Chemical composition CuSiO3H2O
    Crystal system Trigonal
    Habit Prismatic
    Cleavage Perfect, rhombohedral
    Fracture Conchoidal to uneven
    Hardness 5
    Optic nature Uniaxial +
    Refractive index 1.644 - 1.709
    Birefringence 0.053
    Dispersion Medium, 0.030
    Specific gravity 3.28 - 3.35
    Lustre Vitreous
    Pleochroism Weak

    File:Dioptase.gif

    Figure \(\PageIndex{1}\): Faceted Dioptase 
    Photo courtesy of The Gem Trader