 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.  The Iditarod-Ruby Region, Alaska - Page 68by Henry Miner Eakin - 1914 - 45 pagesFull view - About this book
 | Good Roads Institute, Chapel Hill, N.C. - Roads - 1897 - 1172 pages
...accessory minerals. Though hornblende is a rather common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties...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... | |
 | Geology - 1907 - 1026 pages
...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.) - Geology - 1907 - 532 pages
...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... | |
 | Geology, Economic - 1907 - 532 pages
...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. - Roads - 1908 - 772 pages
...accessory minerals. Though hornblende is rather a common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties...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 - Coal - 1910 - 764 pages
...accessory minerals. Though hornblende is rather a common mineral in granite, it is less so in pegmatite. Orthoclase and microcline are the most common varieties...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.... | |
 | Geological Survey (U.S.) - Geology - 1910 - 694 pages
...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...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.... | |
 | University of Arizona. State Bureau of Mines - Mines and mineral resources - 1916 - 444 pages
...pegmatite. In many places, however, a variety of plagioclase feldspar, either albite or orthoclase, makes up part or all of the feldspar component. The...pegmatite, either intermixed with feldspar and mica in granite texture, graphically intergrown with feldspar, or segregated out into large separate masses.... | |
 | Geology - 1922 - 434 pages
...accessory minerals. Though hornblende is rather a common mineral in granite, it is les-s so in pegmatite. Orthoclase and microcline are the most common varieties...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 Carolina... | |
 | Heinrich Ries, William Shirley Bayley - Clay - 1922 - 404 pages
...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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