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Mushroom elbaite from the Kat Chay mine, Momeik, near Mogok, Myanmar: I. Crystal chemistry by SREF, EMPA, MAS NMR and Mössbauer spectroscopy

Published online by Cambridge University Press:  05 July 2018

A. J. Lussier ,
P. M. Aguiar ,
V. K. Michaelis ,
S. Kroeker ,
S. Herwig ,
Y. Abdu  and
F. C. Hawthorne
A. J. Lussier
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
P. M. Aguiar
Affiliation:
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
V. K. Michaelis
Affiliation:
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
S. Kroeker
Affiliation:
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
S. Herwig
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Y. Abdu
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
F. C. Hawthorne*
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
*
*E-mail: frank_hawthorne@umanitoba.ca
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Abstract

Tourmaline from the Kat Chay mine, Momeik, near Mogok, Shan state, Myanmar, shows a variety of habits that resemble mushrooms, and it is commonly referred to as ‘mushroom tourmaline'. The structure of nine single crystals of elbaite, ranging in colour from pink to white to black and purple, extracted from two samples of mushroom tourmaline from Mogok, have been refined (SREF) to R indices of ~2.5% using graphite-monochromated Mo-Kα X-radiation. 11B and 27Al Magic Angle Spinning Nuclear Magnetic Resonance spectroscopy shows the presence of [4]B and the absence of [4]Al in samples with transition-metal content low enough to prevent paramagnetic quenching of the signal. Site populations were assigned from refined site-scattering values and unit formulae derived from electron-microprobe analyses of the crystals used for X-ray data collection. 57Fe Mössbauer spectroscopy shows that both Fe2+ and Fe3+ are present, and the site populations derived by structure refinement show that there is no Fe at the Z site; hence all Fe2+ and Fe3+ occurs at the Y site. The 57Fe Mössbauer spectra also show peaks due to intervalence charge-transfer involving Fe2+ and Fe3+ at adjacent Y sites. Calculation of the probability of the total amount of Fe occurring as Fe2+–Fe3+ pairs for a random short-range distribution is in close accord with the observed amount of Fe involved in Fe2+–Fe3+, indicating that there is no short-range order involving Fe2+ and Fe3+ in these tourmalines.

Keywords

elbaitetourmalinecrystal-structureelectron-microprobe analysisMössbauer spectroscopymagic-angle-spinning nuclear magnetic resonanceMogokMyanmar
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 3 , June 2008 , pp. 747 - 761
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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