HRTEM investigation of microstructures in length-slow chalcedony

Xu Huifang Xu, P. R. Buseck, Luo Gufeng Luo

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

High-resolution transmission electron microscopy reveals dense Brazil-twin boundaries on the unit-cell scale in length-slow chalcedony. The twins can be considered as the result of stacking of left- and right-handed quartz with a (101) twin composition plane. Although most twin sequences on the unit-cell scale are nonperiodic, moganite-type domains result when they are periodic. It is proposed that the twins formed during rapid crystallization rather than as transformation products of a precursor phase such as moganite. The twin boundaries are energetically less stable than twin-free areas and may indicate non-equilibrium crystallization at a high supersaturation of aqueous SiO2 species in the parent fluid.

Original languageEnglish (US)
Pages (from-to)542-545
Number of pages4
JournalAmerican Mineralogist
Volume83
Issue number5-6
StatePublished - Jan 1 1998
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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