Potassium feldspars structurally intermediate between microcline and sanidine

Details Potassium feldspars structurally intermediate between microcline and sanidine Potassium feldspars structurally intermediate between microcline and sanidine

Sep 1954

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954gecoa...6..100g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 6, Issue 2-3, pp.100-108

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Scientific paper

Natural K-feldspars exhibiting all states that are structurally intermediate between sanidine (monoclinic) and microcline (with maximum triclinicity) are described. Data based on X-ray measurements are given for selected materials from a variety of geological occurrences. The possible modes of genesis of these triclinic K-feldspars are discussed. The relation of "orthoclase" to sanidine and microcline is also considered. The difficulty of using information on the polymorphism of KAlSi 3 O 8 , in geologic thermometry is pointed out.

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