 Pegmatite is closely allied to granite in composition. As in granite, the essential constituents are feldspar and quartz, with more or less mica and other accessory minerals. Though hornblende is rather a common mineral in granite, it is less so in pegmatite....  Bulletin - Seite 221922Vollansicht - Über dieses Buch
 | Good Roads Institute, Chapel Hill, N.C. - 1897 - 1172 Seiten
...feldspar and quartz, with more or less mica and other accessory minerals. Though hornblende is a rather common mineral in granite, it is less so in pegmatite....component. The feldspar occurs in masses and rough crystals with a diameter of several feet. In the old Mart Wiseman Mine, near Spruce Pine, Mitchell County, orthoclase... | |
 | 1907 - 1026 Seiten
...Though hornblende is a rather common mineral in granite, it is less so in pegmatite. Orthoclase or microcline are the most common varieties of feldspar...component. The feldspar occurs in masses and rough crystals with a diameter of several feet. In the old Mart Wiseman mine near Sprucepine, Mitchell County, orthoclase... | |
 | 1907 - 532 Seiten
...Though hornblende is a rather common mineral in granite, it is less so in pegmatite. Orthoclase or microcline are the most common varieties of feldspar...component. The feldspar occurs in masses and rough crystals with a diameter of several feet. In the old Mart Wiseman mine near Sprucepine, Mitchell County, orthoclase... | |
 | Geological Survey (U.S.) - 1907 - 532 Seiten
...Though hornblende is a rather common mineral in granite, it is less so in pegmatite. Orthoclase or microcline are the most common varieties of feldspar...component. The feldspar occurs in masses and rough crystals with a diameter of several feet. In the old Mart Wiseman mine near Sprucepine, Mitchell County, orthoclase... | |
 | Good Roads Institute, Chapel Hill, N.C. - 1908 - 772 Seiten
...thick. If the bedding has been preserved, it may lie at any angle with that of the inclosing wall rock. In some places the horses are partly pegmatized by...crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite. In many places it bears much the same... | |
 | Charles Willard Hayes - 1910 - 764 Seiten
...thick. If the bedding has been preserved, it may lie at any angle with that of the inclosing wall rock. In some places the horses are partly pegmatized by...crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite. In many places it bears much the same... | |
 | Geological Survey (U.S.) - 1910 - 694 Seiten
...their mass. In such places no sharp line can be drawn between the pegmatite and the original horse. and microcline are the most common varieties of feldspar...crystals, some of them with a diameter of several feet. Quartz assumes various forms and positions in the pegmatite. In many places it bears much the same... | |
 | Henry Miner Eakin - 1914 - 672 Seiten
...minerals 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...feldspar occurs in masses and rough crystals, some of which may be several feet thick. Quartz occurs in several ways in pegmatite — either intermixed with... | |
 | University of Arizona. State Bureau of Mines - 1916 - 444 Seiten
...pegmatite. In many places, however, a variety of plagioclase feldspar, either albite or orthoclase, makes up part or all of the feldspar component. 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 with... | |
 | 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... | |
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