Crystal chemistry of clinopyroxenes from the St. Marcel manganese deposit, Val d'Aosta, Italy

W. L. Griffin, A. Mottana

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

These Mn-rich rocks contain a wide variety of clinopyroxenes in the Di-Jd-Ac plane; mean microprobe analyses for 43 samples are tabulated. Massive pyroxene-rich rocks contain aegirine-jadeite and impure jadeite zoned via chloromelanite to omphacite. The spread of the 25 samples is consistent with a solvus between Jd60 and Jd85 on the Di-Jd join, but the gap closes at Ac > 20%.- K.A.R.

Original languageEnglish
Pages (from-to)568-586
Number of pages19
JournalAmerican Mineralogist
Volume67
Issue number5-6
Publication statusPublished - 1982
Externally publishedYes

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