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Studies in felspar equilibria at the Geophysical Laboratory, Washington

Published online by Cambridge University Press:  14 March 2018

O. F. Tuttle
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Extract

Evidence for the existence of four series of alkali-felspars has been obtained from X-ray studies of over forty analysed felspars.1 Optical studies confirm these findings, but suggest that transitional forms may occur. The four series are: high-sanidine- high-albite; sanidine high-albite; orthoclase low-albite;microcline-low-albite. Highsanidinc has the optic axial plane parallel to (010) in the potash-rich members, whereas it is perpendicular to (010) in sanidine.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 215 , December 1951 , pp. 757 - 758
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1951

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References

1 N. L. Bowen and O. F. Tuttlc, unpublished. [cf. M.A. 11–325, 327.]

2 Spencer, E., The potash–soda–felspars. I. Thermal stability. Min. Mag., 1937, vol. 24, pp. 453–194.Google Scholar

1 C. Oftedahl, Studies on the igneous rock complex of the Oslo region. IX. The feldspars. Skrifter Norske Vidensk.–Akad. Oslo, I. Mat.–Naturv. KX, [1949], for 1948, no. 3, 71 pp. [M.A. 11–11.]