The Cummingtonite Problem

W. Layton and R. Phillips
Department of Geology, Durham Colleges in the University of Durham

Summary: An examination of available chemical analyses shows that the anthophyllite and cummingtonite series of amphibole minerals are not isodimorphous. Whilst the anthophyllites are truly lime-free amphiboles, small amounts of calcium are essential to stabilize the monoclinic lattice of cummingtonites, which should be regarded as lime-poor amphiboles, analogous to the lime-poor pyroxenes. The existence of synthetic clino-anthophyllites is considered.

Mineralogical Magazine; December 1960 v. 32; no. 251; p. 659-663; DOI: 10.1180/minmag.1960.032.251.08
© 1960, The Mineralogical Society
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