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A nickel-iron analogue of balangeroite and gageite (Sasaguri, Kyushu, Japan)

Bernard W. Evans and Scott M. Kuehner
A nickel-iron analogue of balangeroite and gageite (Sasaguri, Kyushu, Japan)
European Journal of Mineralogy (October 2011) 23 (5): 717-720


In two samples of antigorite serpentinite from Sasaguri, Kyushu, Japan, we have found trace amounts of a NiFe-rich silicate whose atomic proportions in terms of the ratio of M to T cations match those of the fibrous MgFe-silicate hydrate balangeroite. Balangeroite in serpentinite at the type locality in Italy is not reported to contain Ni, whereas the balangeroite analog from Japan has very little MgO. One sample from Japan is nickel-rich (up to 39 wt% NiO), and the other Fe-rich (up to 61 wt% total FeO). The Ni-rich sample appears to contain approximately 2 wt% Cl, and the Fe-rich sample contains up to 2.3 wt% P (sub 2) O (sub 5) . A wide miscibility gap in the ternary system Mg-Fe-Ni separates the Italian and Japanese minerals. Anhydrous microprobe totals are low, and we attribute this to a submicroscopic porosity, which is imaged by electron-beam scanning. Owing to its small grain-size (<25 mu m) and very low modal abundance, our identification is as yet not confirmed by physical methods, such as XRD or micro-Raman spectroscopy.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 23
Serial Issue: 5
Title: A nickel-iron analogue of balangeroite and gageite (Sasaguri, Kyushu, Japan)
Affiliation: University of Washington, Department of Earth and Space Sciences, Seattle, WA, United States
Pages: 717-720
Published: 201110
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 18
Accession Number: 2012-010009
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N33°37'00" - N33°37'00", E130°31'60" - E130°31'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201205
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