Answers

2014-11-25T21:44:58+05:30
Wurtzite boron nitride and lonsdaleite are the current hardest substance 
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2014-11-25T21:50:42+05:30
Wurtzite boron nitride and lonsdaleite(hexagonal diamond) both have greater  indentation strength than diamond it is regarded to be  hardest known material in the world
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