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Which Hard Crystalline Mineral Is Number 7 On The Mohs Scale Of Hardness? It Has Many Different Varieties Depending On Its Crystal Structure, And Thus A Wide Range Of Applications - From Jewellery, Due To Its Many Coloured Varieties, To Electronics Engineering, Due To Its Piezoelectric Properties?

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1. Which Hard Crystalline Mineral Is Number 7 On The Mohs Scale Of Hardness? It Has Many Different Varieties Depending On Its Crystal Structure, And Thus A Wide Range Of Applications - From Jewellery, Due To Its Many Coloured Varieties, To Electronics Engineering, Due To Its Piezoelectric Properties?





 
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