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    arthurtyler's Avatar
    arthurtyler Posts: 1, Reputation: 1
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    #1

    Jun 27, 2007, 11:42 PM
    Emery aggregate
    Can anyone tell me exactly what "Emery" really is and wherabouts it fits on the Mohs scale of hardness?:confused:
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Jun 28, 2007, 12:16 AM
    Emery is a very hard rock type used to make abrasive powder. It largely consists of the mineral corundum (aluminum oxide), mixed with other species such as the iron-bearing spinels hercynite and magnetite, and also rutile (titania). Industrial emery may contain a variety of other minerals and synthetic compounds such as magnesia, mullite, and silica.

    Because it can be a mix of minerals, no definite Mohs hardness can be assigned: the hardness of corundum is 9 and that of some spinel-group minerals is near 8, but the hardness of others such as magnetite is near 6.

    Emery (mineral) - Wikipedia, the free encyclopedia
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