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why is quartz sand so hard

Geology of the Canadian River Valley Geology of the Canadian River Valley. ... the dolomite have been replaced with quartz crystals from silica ... of the reasons why Alibates Flint is so hard, ... The Big Question: What makes diamonds valuable, and why . The company has said its value is hard to gauge before it has been cut and fitted to a piece of jewellery. But a similar-sized stone of lesser quality went for £6m recently. If it is cut and fitted in the right way, the new discovery could make millions more. Hardness: Mineral Properties Micromounts and small embedded crystals are very hard to determine in terms of hardness. One may not be able to test for hardness because .    Read More

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