gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1920.019.91.03 A Graphic Method for the Comparison of Minerals with Four Variable Components Forming Two Isomorphous Pairs1 Simpson Edward S. D.Sc., B.E., F.C.S. Mineralogist and Chemist, Geological Survey of Western Australia

Published by permission of the Government Geologist of Western Australia.

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