Re: Mohs scale of hardness can kick the bucket.



    AFAIK novaculite *is* a form of quartz, it's a sedimentary rock made of very fine quartz crystals...
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On May 15, 2:43 pm, snipped-for-privacy@Example.com wrote:

Alvin: If you look around on Google you will find reference to a book called “Industrial Minerals & Rocks: Commodities, Markets, and Uses”, 7th edition. If you look at the preview in Google Books you will find that on page 153 of the chapter on abrasives it notes that:
    “Natural abrasive stones are made from a wide variety of materials including sandstone, novaculite…The superior cutting quality of some of these stones is due to the well-disseminated, fine-grained inclusions of garnet or other minerals of superior hardness.’
It doesn’t specifically mention garnet earlier in a discussion of novaculite where it notes that material is primarily quartz.
Pittsburgh Pete
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