Systematic Mineralogy Based On a Natural Classification With a General Introduc
Systematic Mineralogy Based On a Natural Classification With a General Introduc
Thomas Sterry Hunt
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The crystallization of the anorthite-albite series is doubly oblique or anorthic, while orthoclase and hyalophane are clinorhombic. Microcline, while having the same chemical composition and den- sity, differs from orthoclase only in being anorthic in crystalliza- tion. It is scarcely distinguishable from orthoclase, with which it is often intimately associated, except by, the use of polarized light. In the green feldspar known as Amazon stone, microcline is thus found mixed with orthoclase, an...d occasionally also with albite. Again, in the so-called perthite, a banded red and white feldspar, found in large cleavable individuals, the white layers, of one or two millimetres in thickness, are albite, and the similar red ones an admixture of orthoclase and microcline, colored by included laminae of hematite. It has been found possible to separate the red and white layers in perthite, and to show the former to be a pot- ash-feldspar with the specific gravity of orthoclase, and the latter a soda-feldspar with the specific gravity and composition of albite.
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