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

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

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 (US)
Pages (from-to)	23-35
Number of pages	13
Journal	American Mineralogist
Volume	78
Issue number	1-2
State	Published - 1993
Externally published	Yes

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

Cite this

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

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",

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year = "1993",

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journal = "American Mineralogist",

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TY - JOUR

T1 - Tremolite-richterite amphiboles

T2 - synthesis, compositional and structural characterization, and thermochemistry

AU - Pawley, A. R.

AU - Graham, C. M.

AU - Navrotsky, A.

PY - 1993

Y1 - 1993

N2 - 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

AB - 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

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M3 - Article

SN - 0003-004X

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JO - American Mineralogist

JF - American Mineralogist

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ER -

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

Abstract

ASJC Scopus subject areas

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