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Books Bücher 1 - 5 von 5 in A distinction is often made between corundum and emery, many not recognizing emery...
" A distinction is often made between corundum and emery, many not recognizing emery as a variety of corundum. There are three names in constant use to designate the varieties of corundum: (1) Sapphire, which includes all corundums of whatever color that... "
The Occurrence and Distribution of Corundum in the United States, - Seite 9
von Joseph Hyde Pratt - 1901 - 98 Seiten
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Proceedings of the Good Roads Institute, Held at the University ..., Bände 1-15

Good Roads Institute, Chapel Hill, N.C. - 1897
...they were successfully worked, but as soon as the hard rock was encountered the mine had to shut down. There are three names in constant use to designate...varieties of corundum: 1. Sapphire, which includes all of those corundums that are transparent to semi-transparent, of whatever color ; 2. Corundum, including...
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Mineral Resources of the United States

United States. Bureau of Mines - 1902
...garnet since 1894. CORUNDUM AND EMKRY. A distinction is often made between corundum and emery, many not recognizing emery as a variety of corundum. There...mechanical admixture of corundum and magnetite or hematite. It is these last two varieties that are used in the arts for abrasive purposes, ornery being used in...
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Mineral Resources of the United States

United States. Bureau of Mines - 1902
...often made between corundum and emery, many not recognizing emery as a variety of corundum. There arc three names in constant use to designate the varieties...mechanical admixture of corundum and magnetite or hematite. It is these last two varieties that are used in the arts for abrasive purposes, emery being used in...
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Economic paper

1902
...they were successfully worked, but as soon as the hard rock was encountered the mine had to shut down. There are three names in constant use to designate...varieties of corundum: 1. Sapphire, which includes all of those corundums that are transparent to semi-transparent. of whatever color; 2. Corundum, including...
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Mineral Resources of the United States

1902
...gnrnfl since 1S94. CORUNDUM AND EMERY. A distinction is often made between corundum and emery, many not recognizing emery as a variety of corundum. There...varieties of corundum: (1) Sapphire, which includes nil corundums of whatever color that are transparent to scmitransparent; (2) Corundum, including the...
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