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Refinement of hydrogen positions in natural chondrodite by powder neutron diffraction; implications for the stability of humite minerals

A. J. Berry and M. James
Refinement of hydrogen positions in natural chondrodite by powder neutron diffraction; implications for the stability of humite minerals
Mineralogical Magazine (June 2002) 66 (3): 441-449

Abstract

The structure of a natural sample of chondrodite (Mg (sub 4.89) Fe (sub 0.07) Si (sub 2.04) O (sub 8) F (sub 1.54) (OH) (sub 0.46) ) was refined using powder neutron diffraction data and the Rietveld technique (P2 (sub 1) /b; Z= 2; a = 4.7204(1) Aa; b = 10.2360(3) Aa; c = 7.8252(2) Aa; alpha = 109.11(1) degrees ; V = 357.26(2) Aa (super 3) ). Hydrogen was found to occupy the H1 site. The significance of hydrogen at this site is discussed in terms of hydrogen-bond stabilization of humite structures containing varying amounts of OH, F and Ti. Arguments are proposed as to why the F and Ti contents of natural humites usually result in only one H per formula unit when there is no crystal-chemical reason why fully hydrated samples should not be favoured.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 66
Serial Issue: 3
Title: Refinement of hydrogen positions in natural chondrodite by powder neutron diffraction; implications for the stability of humite minerals
Affiliation: Australian National University, Research School of Earth Sciences, Canberra, Australia
Pages: 441-449
Published: 200206
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 35
Accession Number: 2002-073307
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Australian Nuclear Science and Technology Organisation, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200223
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