Amphiboles on the join pargasite-ferropargasite

Journal Article · Mon Sep 01 00:00:00 EDT 1980 · Am. Mineral.; (United States)

OSTI ID:6686050

Charles, R W

Amphiboles have been grown across the join NaCa/sub 2/Mg/sub 4/AlSi/sub 6/Al/sub 2/O/sub 22/(OH)/sub 2/ to NaCa/sub 2/Fe/sub 4/AlSi/sub 6/Al/sub 2/O/sub 22/(OH)/sub 2/ on QFM and CCH/sub 4/ oxygen buffers to gain insight into the Fe-Mg substitution in an amphibole without the local charge imbalance caused by Na in the M(4) site. Oxygen fugacity was found to have no effect upon the unit-cell dimensions of amphibole. No change in cell parameters is observed with temperature on a given buffer. The essentially linear trend indicates disorder of Mg and Fe in M(1), M(2), and M(3) sites. Plagioclase and pyroxene were present in all charges. The amount ranged from a few percent to greater than 30%, without affecting the unit-cell parameters of coexisting amphibole.

• Research Organization: Los Alamos Scientific Lab., NM
• OSTI ID: 6686050
• Journal Information: Am. Mineral.; (United States), Vol. 65:9, 10
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
HORNBLENDE
CRYSTAL STRUCTURE
CHEMICAL COMPOSITION
CRYSTAL GROWTH
EXPERIMENTAL DATA
IRON
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ALKALINE EARTH METALS
AMPHIBOLE
DATA
ELEMENTS
INFORMATION
METALS
MINERALS
NUMERICAL DATA
TRANSITION ELEMENTS
580300* - Mineralogy
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