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Books Bücher 1 - 6 von 6 in ... distinct. Most of the bronze corundum is in rough crystals, but some have been...
" ... distinct. Most of the bronze corundum is in rough crystals, but some have been found that have the prismatic faces smooth and well developed, and these are often dark, almost black, in color. One crystal of this dark kind, found some years ago, yielded... "
The Occurrence and Distribution of Corundum in the United States, - Seite 45
von Joseph Hyde Pratt - 1901 - 98 Seiten
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Bulletin, Ausgaben 9-12

1895
...this dark kind, found some years ago, yielded gems § of an inch in diameter. A similar asterism has been noticed in many of the rubies and sapphires from Cowee Valley, and at several other points in the State. According to Von Lasaulx, it is sometimes produced by rifts due...
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Bulletin, Ausgaben 267-273

1905
...prismatic faces smooth and well developed, and these are often dark, almost black, in color. Asterism has been noticed in many of the rubies and sapphires from...thin, sharp, and rectilinear, and are parallel to the intersection of the prism and the base. In other cases asterism is undoubtedly due to the rutile or...
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Corundum and the Peridotites of Western North Carolina

Joseph Hyde Pratt, Joseph Volney Lewis - 1905 - 464 Seiten
...Lasaulx,1' by the rifts due to the basal parting. The lamellae produced by this, when examined under the microscope, are seen to be very thin, sharp and rectilinear, and appear as striations on the sides of the prism (fig. 14). In other, cases, asterism is undoubtedly...
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Bulletin, Ausgabe 12

North Carolina. Division of Mineral Resources - 1907
...this dark kind, found some years ago, yielded gems f of an inch in diameter. A similar asterism has been noticed in many of the rubies and sapphires from Cowee Valley, and at several other points in the State. According to Von Lasaulx, it is sometimes produced by rifts due...
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History of the Gems Found in North Carolina

George Frederick Kunz - 1907 - 60 Seiten
...this dark kind, found some years ago, yielded gems § of an inch in diameter. A similar asterism has been noticed in many of the rubies and sapphires from Cowee Valley, and at several other points in the State. According to Von Lasaulx, it is sometimes produced by rifts due...
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History of the gems found in North Carolina

George Frederick Kunz - 1907 - 60 Seiten
...this dark kind, found some years ago, yielded gems f of an inch in diameter. A similar asterism has been noticed in many of the rubies and sapphires from Cowee Valley, and at several other points in the State. According to Von Lasaulx, it is sometimes produced by rifts due...
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