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Geosciences LibreTexts

16.06.0108: Sard

  • Page ID
    4113
  • Agate
    Chemical composition SiO2 Silicon dioxide
    Crystal system Trigonal
    Habit Aggregate
    Fracture Conchoidal
    Hardness 6.5-7
    Refractive index ± 1.54
    Specific gravity 2.60
    Lustre Vitreous