Amphibole Compositional Space

R. Phillips
Department of Geology, University of Durham

Summary: The basic formula of an amphibole is completely defined by stating the number of sodium atoms in X positions and the numbers of aluminium atoms in Y and Z. These three numbers are coordinates in a compositional space that can easily be represented. The alkali amphiboles are re-defined as having at least one atom of sodium in X in the basic formula unit. A systematic nomenclature for the calciferous and alkali amphiboles is suggested using existing end-member names.

Mineralogical Magazine; September 1966 v. 35; no. 275; p. 945-952; DOI: 10.1180/minmag.1966.035.275.05
© 1966, The Mineralogical Society
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