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Geosciences LibreTexts

16.5.8: Smokey Quartz

  • Page ID
    4094
  • Smoky Quartz
    Chemical composition SiO2 Silicon dioxide
    Crystal system Trigonal
    Habit Prismatic
    Cleavage Poor
    Fracture Conchoidal
    Hardness 7
    Optic nature Uniaxial +
    Refractive index 1.544 - 1.553
    Birefringence 0.009
    Dispersion 0.013
    Specific gravity 2.65
    Lustre Vitreous
    Pleochroism Weak to moderate