Lamellar Structure of Potash-Soda Felspars

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IN an extremely interesting paper, Ito1 has recently described the results of an X-ray examination of a Korean moonstone which he assumes to be similar to a specimen (described by E. Spencer2) containing approximately equal amounts of potash felspar and soda felspar, showing a blue schiller, and resembling sanidine in its glass-clear appearance and in having an abnormally low optic axial angle. Ito concludes that this crystal is an intimate intergrowth of a (monoclinic) potash felspar having the sanidine structure, and a corresponding high-temperature monoclinic form of soda felspar.

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  1. 1

    Ito, T., Z. Krist., 100, 297 (1938).

  2. 2

    Spencer, E., Min. Mag., 22, 291 (1930); 24, 453 (1937); 25, 87 (1938).

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CHAO, S., TAYLOR, W. Lamellar Structure of Potash-Soda Felspars. Nature 143, 1024–1025 (1939) doi:10.1038/1431024b0

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