 | Good Roads Institute, Chapel Hill, N.C. - Roads - 1897 - 1172 pages
...these segregations is massive and generally granular, though locally crystallized. In the latter case it may be translucent or clear and of a dark smoky...rather pure and does not contain feldspar or mica in any quantity. Muscovite is the common mica of pegmatite and is the only variety mined in North Carolina.... | |
 | Geology - 1907 - 1026 pages
...these segregations is massive and generally granular, though locally crystallized. In the latter case it may be translucent or clear and of a dark smoky...rather pure and does not contain feldspar or mica in am quantity. Muscovite is the common mica of pegmatite and is the only variet \ mined in North Carolina.... | |
 | Geological Survey (U.S.) - Geology - 1907 - 532 pages
...these segregations is massive and generally granular, though locally crystallized. In the latter case it may be translucent or clear and of a dark smoky...rather pure and does not contain feldspar or mica in any quantity. Muscovite is the common mica of pegmatite and is the only variety mined in North Carolina.... | |
 | Geology, Economic - 1907 - 532 pages
...these segregations is massive and generally granular, though locally crystallized. In the latter case it may be translucent or clear and of a dark smoky...rather pure and does not contain feldspar or mica in any quantity. Muscovite is the common mica of pegmatite and is the only variety mined in North Carolina.... | |
 | Good Roads Institute, Chapel Hill, N.C. - Roads - 1908 - 772 pages
...times larger than in ordinary granite. Not uncommonly the quartz and feldspar assume a graphic granite texture in a portion of the pegmatite. Another common...feldspar or mica in appreciable quantity. Muscovite is the common mica of pegmatite and is the only variety mined in North Carolina. Biotite occurs in moderate... | |
 | Geological Survey (U.S.) - Geology - 1910 - 694 pages
...times larger than in ordinary granite. Not uncommonly the quartz and feldspar assume a graphic granite texture in a portion of the pegmatite. Another common...feldspar or mica in appreciable quantity. Muscovite is the common mica of pegmatite and is the only variety mined in North Carolina. Biotite occurs in moderate... | |
 | Charles Willard Hayes - Coal - 1910 - 764 pages
...times larger than in ordinary granite. Not uncommonly the quartz and feldspar assume a graphic granite texture in a portion of the pegmatite. Another common...feldspar or mica in appreciable quantity. Muscovite is the common mica of pegmatite and is the only variety mined in North Carolina. Biotite occurs in moderate... | |
 | Geology - 1922 - 434 pages
...one another; but the individual grains are many times larger than in ordinary granite. Not uncommonly the quartz and feldspar assume a graphic-granite texture...feldspar or mica in appreciable quantity. Muscovite is the common mica of pegmatite. * * * Biotite occurs in moderate quantity in a few deposits ami in smaller... | |
 | North Carolina. Department of Conservation and Development - Geology - 1925 - 298 pages
...constituting varying proportions of the pegmatite. Their thickness ranges from a fraction of an inch up to six or more feet. Many of them are lenticular in shape,...feldspar or mica in appreciable quantity. Muscovite is the common mica of pegmatite. Biotite occurs in moderate quantity in a few deposits, and in smaller... | |
 | North Carolina. Division of Mineral Resources - Geology - 1925 - 138 pages
...constituting varying proportions of the pegmatite. Their thickness ranges from a fraction of an inch up to six or more feet. Many of them are lenticular in shape,...feldspar or mica in appreciable quantity. Muscovite is the common mica of pegmatite. Biotite occurs in moderate quantity in a few deposits, and in smaller... | |
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Their thickness ranges from a fraction of an inch up to 6 or more feet. Many of them are lenticular in shape, the length varying from four or five to twenty or more times the thickness. ' In numerous places these quartz streaks or veins are persistent... 
