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" 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 - United States Geological Survey - Page 51
by Geological Survey (U.S.) - 1903
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Bulletin, Issues 208-212

Geology - 1903
...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...
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A Study of the Fauna of the Hamilton Formation of the ..., Volume 8, Issue 206

Herdman Fitzgerald Cleland - Paleontology - 1903 - 112 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...
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Report of the State Geologist on the Mineral Industries and ..., Volume 4

Vermont. State Geologist - Geology - 1904
...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...
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Congressional Serial Set

United States - 1902
...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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