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Chemical and physical properties of Neelam Stone

  1. Mohs scale hardness : 9.0
  2. Luster : Luster
  3. Streak : white
  4. Specific gravity : 3.95–4.03
  5. Optical properties : 72.2
  6. Refractive index : 1.768–1.772, 1.760–1.763