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

Hiromi Konishi, P R Buseck, Huifang Xu, Xiaochun Li

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Proto-polsemorphs 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 β=90.026(18)°. 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.

Original languageEnglish (US)
Pages (from-to)351-359
Number of pages9
JournalAmerican Mineralogist
Volume93
Issue number2-3
DOIs
StatePublished - Feb 2008

Fingerprint

inosilicate
Silicates
Polymorphism
Japan
silicates
Lattice constants
High resolution transmission electron microscopy
Diffraction patterns
diffraction
transmission electron microscopy
extinction
X-ray diffraction
diffraction patterns
X ray diffraction
high resolution

Keywords

  • Biopyriboles
  • Chesterite
  • Hayachine
  • HRTEM
  • Jimthompsonite
  • Protoanthophyllite
  • Protopyribole
  • Serpentinite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Proto-polymorphs of jimthompsonite and chesterite in contact-metamorphosed serpentinites from Japan. / Konishi, Hiromi; Buseck, P R; Xu, Huifang; Li, Xiaochun.

In: American Mineralogist, Vol. 93, No. 2-3, 02.2008, p. 351-359.

Research output: Contribution to journalArticle

Konishi, Hiromi ; Buseck, P R ; Xu, Huifang ; Li, Xiaochun. / Proto-polymorphs of jimthompsonite and chesterite in contact-metamorphosed serpentinites from Japan. In: American Mineralogist. 2008 ; Vol. 93, No. 2-3. pp. 351-359.
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