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Which stone has a hardness of 7 in the Mohr’s hardness scale?(a) Quartz(b) Calcite(c) Gypsum(d) TopazThe question was asked by my school principal while I was bunking the class.My doubt stems from Tests on Stones in chapter Materials for Construction of Basic Civil Engineering

Answer»

Correct CHOICE is (a) Quartz

The best explanation: MOHR’s hardness scale ranks stones ACCORDING to their hardness numbers. CALCITE has a hardness of 3, gypsum 2 and topaz 8.



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