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Geosciences LibreTexts

16.6.1.7: Onyx

  • Page ID
    4112
  • Agate
    Chemical composition SiO2 Silicon dioxide
    Crystal system Trigonal
    Habit Aggregate
    Fracture Conchoidal
    Hardness 6.5-7
    Refractive index 1.535 - 1.539
    Specific gravity 2.60
    Lustre Vitreous