Showing posts with label hardness. Show all posts
Showing posts with label hardness. Show all posts

Sunday, June 23, 2019

HARDNESS

HARDNESS


  • HARDNESS is not related to toughness
  • HARDNESS test is potentially destructive
  • HARDNESS test is conducted on rough crystals
  • AT THE BACK OF OPAQUE CABOCHON AND CARVED PIECES    
                    
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