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Books Bücher 1 - 10 von 10 in More commonly the larger crystals will be found either in clusters at intervals through...
" More commonly the larger crystals will be found either in clusters at intervals through the "vein," in places connected by streaks of small crystals, or collected along one or both walls of the pegmatite, with some of the crystals partly embedded in the... "
Bulletin - Seite 409
1907
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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
...there is a quartz streak within the pegmatite, the mica occurs on either or both sides of it, beiug in places partly embedded in the quartz or occupying...masses, feldspar in considerable quantity, kaolin in large deposits, beryl of several gem varieties, zircon, uranium minerals carrying radium, samarskite,...
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Bulletin - United States Geological Survey, Ausgabe 315

Geological Survey (U.S.) - 1907
...mica is generally of dark color and much of it "specked." The true color of mica is best observed in sheets from one-sixteenth to one-fourth inch in thickness...minerals have been found in the pegmatites of North Carolina.0 Besides muscovite mica, several others of commercial importance are found, including quartz...
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Contributions to Economic Geology, 1906: Metals and nonmetals, except fuels

Edwin Clarence Eckel, Samuel Franklin Emmons - 1907
...mica is generally of dark color and much of it "specked." The true color of mica is best observed in sheets from one-sixteenth to one-fourth inch in thickness...minerals have been found in the pegmatites of North Carolina.0 Besides muscovite mica, several others of commercial importance are found, including quartz...
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Congressional Serial Set

1908
...there is a quartz streak within the pegmatite, the mica occurs on either or both sides ot it, being partly embedded in the quartz or occupying any of...noted above in the remaining portion of the pegmatite. Commercially valuable deposits of phlogopite are not known to occur in the United States. Deposits...
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Mineral Resources of the United States, Teil 2

United States. Bureau of Mines - 1908
...there is a quartz streak within the pegmatite, the mica occurs on either or botn sides ot it, being partly embedded in the quartz or occupying any of...noted above in the remaining portion of the pegmatite. Commercially valuable deposits of phlogopite are not known to occur in the United States. Deposits...
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Proceedings of the Good Roads Institute, Held at the University ..., Bände 16-25

Good Roads Institute, Chapel Hill, N.C. - 1908
...on either or both sides of it. The mica may be partly embedded in the quartz or be scattered through the remaining portion of the pegmatite, which generally is composed largely of feldspar. "Mica capping" is a miner's term for an aggregation of mica and quartz, with or without feldspar and...
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Bulletin - United States Geological Survey, Ausgabe 430

Geological Survey (U.S.) - 1910
...on either or both sides of it. The mica may be partly embedded in the quartz or be scattered through the remaining portion of the pegmatite, which generally is composed largely of feldspar. "Mica capping" is a miner's term for an aggregation of mica and quartz, with or without feldspar and...
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High-grade Clays of the Eastern United States: With ..., Band 8,Ausgabe 708

Heinrich Ries, William Shirley Bayley - 1922 - 314 Seiten
...on either or both sides of it. The mica may be partly embedded in the quartz or be scattered through the remaining portion of the pegmatite, which generally is composed largely of feldspar. The dike rocks in places contain garnet, beryl, tourmaline, and other rarer compounds. During kaolinization...
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Bulletin, Ausgabe 708

1922
...on either or both sides of it. The mica may be partly embedded in the quartz or be scattered through the remaining portion of the pegmatite, which generally is composed largely of feldspar. The dike rocks in places contain garnet, beryl, tourmaline, and other rarer compounds. During kaolinization...
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Congressional Serial Set

1907
...The true color of mica is best observed in sheets from one-sixteenth to one-fourth inch in^fchickness when examined in transmitted light. The mica occupies...minerals have been found in the pegmatites of North Carolina.0 Besides muscovite mica, several others of commercial importance are found, including quartz...
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