Tremolite-richterite amphiboles: synthesis, compositional and structural characterization, and thermochemistry

A. R. Pawley; C. M. Graham; A. Navrotsky

Tremolite-richterite amphiboles: synthesis, compositional and structural characterization, and thermochemistry

A. R. Pawley, C. M. Graham, A. Navrotsky

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Abstract

The substitution NaNa□_-1Ca_-1, which fills the A site, has been investigated in amphiboles close to the join tremolite-richterite. At 1123 K, compositions of amphiboles synthesized from bulk compositions on this binary are displaced towards magnesio-cummingtonite [Mg₇Si₈O₂₂(OH)₂], such that average compositions are better represented by the pseudobinary tremolite₉₂magnesio-cummingtonite₈-richterite. Major-element compositions and H₂O contents are close to theoretical values for eight samples synthesized along this join. Unit-cell parameters vary smoothly with composition, a sin β showing the greatest increase as Na fills the A site. High-resolution transmission electron microscopy demonstrates that the amphiboles are highly ordered, with only the tremolite-rich compositions containing any chain multiplicity faults. -from Authors

Original language	English
Pages (from-to)	23-35
Number of pages	13
Journal	American Mineralogist
Volume	78
Issue number	1-2
Publication status	Published - 1 Jan 1993

Keywords

amphibole
mineral synthesis
richterite
thermochemistry
tremolite

Cite this

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AU - Pawley, A. R.

AU - Graham, C. M.

AU - Navrotsky, A.

PY - 1993/1/1

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KW - mineral synthesis

KW - richterite

KW - thermochemistry

KW - tremolite

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Tremolite-richterite amphiboles: synthesis, compositional and structural characterization, and thermochemistry

Abstract

Keywords

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