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

W. L. Griffin; A. Mottana

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

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	568-586
Number of pages	19
Journal	American Mineralogist
Volume	67
Issue number	5-6
Publication status	Published - 1982
Externally published	Yes

Cite this

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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.",

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AU - Griffin, W. L.

AU - Mottana, A.

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N2 - 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.

AB - 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.

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ER -

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

Abstract

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