Structural disparities between chalcedony and macrocrystalline quartz

Peter J. Heaney, D. R. Veblen, J. E. Post

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Examination of length-fast chalcedony by transmission electron microscopy reveals significant structural differences between microcrystalline fibrous quartz and ideal α quartz. Individual crystals that make up chalcedony fibers are elongate along [110] and are twisted about the fiber axis. Streaks in electron diffraction patterns of single fibers indicate pervasive disorder among the {101} and possibly the {011} planes, and in dark-field images the texture of this structural disorder appears dendritic. Because the streak systems associated with {101} and with {011} intersect at the expected locations of primary diffractions associated with the mineral "moganite', demonstrations of the presence of "moganite' require complementary characterization techniques, such as X-ray powder diffraction -from Authors

Original languageEnglish (US)
Pages (from-to)452-460
Number of pages9
JournalAmerican Mineralogist
Volume79
Issue number5-6
StatePublished - Jan 1 1994

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chalcedony
Quartz
quartz
diffraction
fibers
Fibers
disorders
Electron diffraction
X ray powder diffraction
Diffraction patterns
Minerals
transmission electron microscopy
Demonstrations
diffraction patterns
textures
electron diffraction
Textures
Diffraction
examination
texture

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Heaney, Peter J. ; Veblen, D. R. ; Post, J. E. / Structural disparities between chalcedony and macrocrystalline quartz. In: American Mineralogist. 1994 ; Vol. 79, No. 5-6. pp. 452-460.
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Structural disparities between chalcedony and macrocrystalline quartz. / Heaney, Peter J.; Veblen, D. R.; Post, J. E.

In: American Mineralogist, Vol. 79, No. 5-6, 01.01.1994, p. 452-460.

Research output: Contribution to journalArticle

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