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GEOREF RECORD

Proto-polymorphs of jimthompsonite and chesterite in contact-metamorphosed serpentinites from Japan

Hiromi Konishi, Peter R. Buseck, Huifang Xu and Xiaochun Li
Proto-polymorphs of jimthompsonite and chesterite in contact-metamorphosed serpentinites from Japan (in Petrologic mineralogy, the study of minerals in context; a memorial in honor of Charles V. Guidotti, M. Darby Dyar (prefacer), Edward S. Grew (prefacer), Darrell J. Henry (prefacer) and Francesco P. Sassi (prefacer))
American Mineralogist (February 2008) 93 (2-3): 351-359

Abstract

Proto-polymorphs of jimthompsonite and chesterite occur in metamorphosed serpentinites from two Japanese ultramafic complexes. The lattice constants of the proto triple-chain silicate, measured by X-ray diffraction, are a = 0.93605(208), b = 2.72560(588), and c = 0.53160(89) nm, whereas those of the mixed double- and triple-chain silicate are a = 0.94202(78), b = 4.54402(392), c = 0.53440(45) nm, and beta = 90.026(18) degrees . The lattice constants and systematic extinctions revealed by selected-area diffraction patterns are consistent with proto-triple-chain silicate (Pbcn) and mixed double- and triple-chain silicate (A2/m, Am), but not with the ortho- and clino-polymorphs. High-resolution transmission electron microscopy [016] images of the triple-chain silicate and [0 1 15] images of the mixed-chain silicate indicate they have a (.X) configuration. Proto forms of wide-chain pyriboles might be geologically widespread.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 93
Serial Issue: 2-3
Title: Proto-polymorphs of jimthompsonite and chesterite in contact-metamorphosed serpentinites from Japan
Title: Petrologic mineralogy, the study of minerals in context; a memorial in honor of Charles V. Guidotti
Author(s): Konishi, HiromiBuseck, Peter R.Xu, HuifangLi, Xiaochun
Author(s): Dyar, M. Darbyprefacer
Author(s): Grew, Edward S.prefacer
Author(s): Henry, Darrell J.prefacer
Author(s): Sassi, Francesco P.prefacer
Affiliation: University of Wisconsin, Department of Geology and Geophysics, Madison, WI, United States
Affiliation: Mount Holyoke College, Department of Astronomy, South Hadley, MA, United States
Pages: 351-359
Published: 200802
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 24
Accession Number: 2008-066374
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: University of Maine, USA, United StatesLouisiana State University, USA, United StatesUniversity of Padova, ITA, ItalyArizona State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200816
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