 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 4051907Vollansicht - Über dieses Buch
 | Good Roads Institute, Chapel Hill, N.C. - 1897 - 1172 Seiten
...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,... | |
 | Geological Survey (U.S.) - 1907 - 532 Seiten
...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... | |
 | 1907 - 532 Seiten
...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... | |
 | 1908 - 916 Seiten
...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... | |
 | United States. Bureau of Mines - 1908 - 906 Seiten
...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... | |
 | Good Roads Institute, Chapel Hill, N.C. - 1908 - 772 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. "Mica capping" is a miner's term for an aggregation of mica and quartz, with or without feldspar and... | |
 | Charles Willard Hayes - 1910 - 764 Seiten
...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... | |
 | Geological Survey (U.S.) - 1910 - 694 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. "Mica capping" is a miner's term for an aggregation of mica and quartz, with or without feldspar and... | |
 | Heinrich Ries, William Shirley Bayley - 1922 - 404 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... | |
 | 1922 - 434 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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