 | Good Roads Institute, Chapel Hill, N.C. - 1897 - 1172 Seiten
...Though hornblende is a rather common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties of feldspar...of several feet. In the old Mart Wiseman Mine, near Spruce Pine, Mitchell County, orthoclase crystals 2 by 4 feet and larger have been cut through. From... | |
 | Good Roads Institute, Chapel Hill, N.C. - 1908 - 772 Seiten
...Though hornblende is rather a common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties of feldspar...The feldspar occurs in masses and rough crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite.... | |
 | Charles Willard Hayes - 1910 - 764 Seiten
...Though hornblende is rather a common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties of feldspar...The feldspar occurs in masses and rough crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite.... | |
 | Henry Miner Eakin - 1914 - 672 Seiten
...measure a number of feet across, and both these extremes may be found in the same deposit. Orthoclase and microcline are the most common varieties of feldspar...The feldspar occurs in masses and rough crystals, some of which may be several feet thick. Quartz occurs in several ways in pegmatite — either intermixed... | |
 | University of Arizona. State Bureau of Mines - 1916 - 444 Seiten
...feldspar and quartz, with or without mica and other minerals, and is allied to granite. Ortho-clase and microcline are the most common varieties of feldspar...In many places, however, a variety of plagioclase feldspar, either albite or orthoclase, makes up part or all of the feldspar component. The feldspar... | |
 | 1922 - 434 Seiten
...Though hornblende is rather a common mineral in granite, it is les-s so in pegmatite. Orthoclase and microcline are the most common varieties of feldspar...The feldspar occurs in masses and rough crystals, some of them with a diameter of several feet. 1J Sterrett, DB, Mica deposits of North Carolina : North... | |
 | Heinrich Ries, William Shirley Bayley - 1922 - 404 Seiten
...common varieties of feldspar found in pegmatite. lu many places, however, a variety of plagioclasc, either albite or oligoclase, makes up part or all of the feldspar component. The feldspar occurs in musses and rough crystals, some of them with a diameter of several feel. "Sterrett, 1). 1!., Mica <li-|m*itH... | |
 | North Carolina. Department of Conservation and Development - 1925 - 298 Seiten
...Though hornblende is rather a common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties of feldspar...The feldspar occurs in masses and rough crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite.... | |
 | North Carolina. Division of Mineral Resources - 1925 - 138 Seiten
...Though hornblende is rather a common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties of feldspar...The feldspar occurs in masses and rough crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite.... | |
 | 1921 - 650 Seiten
...Though hornblende is rather a common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties of feldspar...The feldspar occurs in masses and rough crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite.... | |
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Orthoclase and microcline are the most common varieties of feldspar found in pegmatite. In many places, however, a variety of plagioclase, either albite or oligoclase, makes up part or all of the feldspar component. 