 The microperthite is especially interesting on account of its typical development. The usual intergrowth is that of orthoclase with a plagioclase varying from albite to an acid oligoclase near Ab5An,, but on many cleavage pieces it was easily proved that...  Bulletin of the United States Geological Survey - Page 51by Geological Survey (U.S.) - 1903Full view - About this book
 | Geology - 1903 - 898 pages
...crystallization. "Zeit. filr Kryst., Vol. XVI, ISSW, p. 281. Thfe microperthite is especially interest ing 011 account of its typical development. The usual intergrowth...plagioclase varying from albite to an acid oligoclase near Ab5An,, but on many cleavage pieces it was easily proved that the triclinic feldspar was intergrown... | |
 | Herdman Fitzgerald Cleland - Paleontology - 1903 - 594 pages
...the species could be determined. All of them are undoubtedly the product of primary crystallization. The microperthite is especially interesting on account...plagioclase varying from albite to an acid oligoclase near Ab5An,, but on many cleavage pieces it was easily proved that the triclinic feldspar was intergrown... | |
 | Vermont. State Geologist - Geology - 1904 - 416 pages
...the species could be determined. All of them are undoubtedly the product of primary crystalization. The microperthite is especially interesting on account of its typical development. The pure potash feldspar is comparatively rare. It occurs as orthoclase and as microline, both contemporaneous... | |
 | United States - 1902 - 982 pages
...crystallization. - Zeit. flir Kryst., Vol. XVI, 1880, p. 281. The microperthite is especially intere.stingon account of its typical development. The usual intergrowth...plagioclase varying from albite to an acid oligoclase near Ab5An,, but on many cleavage pieces it was easily proved that the triclinic feldspar was intergrown... | |
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