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X-ray characterization of Mg, Fe, and Mn natural end-members of the axinite group

Published online by Cambridge University Press:  10 January 2013

Gabriella Salviulo*
Affiliation:
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, 35137 Padova, Italy
Giovanni B. Andreozzi
Affiliation:
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, 35137 Padova, Italy
Giorgio Graziani
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma “La Sapienza,” P.le A. Moro 5, 00185 Roma, Italy
*
a)Electronic mail: gabri@dmp.unipd.it

Abstract

New powder X-ray diffraction data for magnesio-, ferro-, and manganaxinite, obtained from samples closely corresponding to the three end-members of the axinite mineral group, were obtained using a conventional Bragg–Brentano diffractometer. Space group is P 1¯. Powder patterns were indexed using Peacock's normal orientation, which gave: a=7.1381(3), b=9.1626(4), c=8.9421(4) Å, α=91.903(4), β=98.105(3), γ=77.468(4)° for magnesioaxinite; a=7.1479(4), b=9.1962(5), c=8.9576(4) Å, α=91.857(4), β=98.177(4), γ=77.359(4)° for ferroaxinite, and a=7.1849(4), b=9.2152(5), c=8.9765(4) Å, α=91.761(4), β=98.153(4), γ=77.150(4)° for manganaxinite. Peacock's orientation has been adopted in all recent structural and crystal chemical studies of axinite, but it differs from that reported on the JCPDS cards (29-344, 27-076 and 27-084, respectively). New data include an increased number of indexed peaks.

Type
New Diffraction Data
Copyright
Copyright © Cambridge University Press 2000

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