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.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
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
AN - SCOPUS:0027426519
SN - 0003-004X
VL - 78
SP - 23
EP - 35
JO - American Mineralogist
JF - American Mineralogist
IS - 1-2
ER -