Journal ArticleDOI
High-Temperature Albite and Contiguous Feldspars
O. F. Tuttle,N. L. Bowen +1 more
TLDR
In this article, high and low-temperature modifications of albite are shown to have X-ray and optical properties different than those of the very pure natural albites from pegmatites, but these natural albits can, by heating, be converted into a form identical with the synthetic product.Abstract:
Synthetic albite is found to have X-ray and optical properties different than those of the very pure natural albites from pegmatites, but these natural albites can, by heating, be converted into a form identical with the synthetic product. High- and low-temperature modifications of albite are thus indicated. The inversion temperature is believed to be in the neighborhood of 700° C. Optical and X-ray studies show that the inversion extends into the plagiocla.se series approximately to $$An_{35}$$. These high-temperature plagioclases are common as phenocrysts in extrusive rocks but have not been found in plutonic rocks.read more
Citations
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The microcline-sanidine stability relations
Julian R. Goldsmith,Fritz Laves +1 more
TL;DR: In this article, states that are structurally intermediate between the triclinic and monoclinic modifications of KAlSi3O3 are described and discussed with relation to order-disorder in alloys.
Journal ArticleDOI
Experimental deformation of crystalline rocks
TL;DR: In this paper, the authors used the Coulomb criterion to predict the principal stress direction of deformation in micaceous basements, including biotite and plagioclase.
Journal ArticleDOI
The Alkali-Feldspar Join in the System NaAlSiO_{4}-KAlSiO_{4}-SiO_{2}
TL;DR: In this article, an unbroken series of solid solutions between these alkali feldspars with a minimum on the melting and freezing curves at 1,063^{\circ} \pm 3^{circ} C$$ was shown.
Journal ArticleDOI
XVIII.—The Geochemistry of the Charnockite Series of Madras, India
TL;DR: In this article, the charnockite series in Peninsular India has been re-examined, with particular reference to their chemistry and chemical mineralogy, to provide further evidence for their mode of origin.
References
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Journal ArticleDOI
Isomorphous Replacement and Superlattice Structures in the Plagioclase Felspars
S. H. Chao,W. H. Taylor +1 more
TL;DR: From X-ray oscillation and rotation photographs of a limited number of plagioclase felspars, it seems probable that the structure type depends upon the chemical composition in the following way.
Journal ArticleDOI
The Mineralography of the Feldspars Part II
TL;DR: In this paper, the Potash-Soda Series and Potash Lime Series were used to define the twining of Feldspars, as well as the two extremes of the Dittler Combination of Two Extremes.
Journal ArticleDOI
Studies in the Feldspar Group
TL;DR: In this article, the relations between composition and optic properties in three different phases of potash feldspar are shown in three diagrams, and those between adularia and celsian in a fourth.