Structural relationship between pyrite and marcasite

István Dódony, Mihály Pósfai, P R Buseck

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We studied pyrite spherules built of radiating crystals to establish the relationships among microstructure, composition, and macroscopic appearance. Results of high-resolution transmission electron microscopy (HRTEM) imaging and selected-area electron diffraction (SAED) show that many pyrite crystals contain planar faults perpendicular to one of the [001] axes. A comparison between HRTEM micrographs and images simulated for defect model structures indicates that the faults can be interpreted as single (101) layers of marcasite that disrupt the regular sequence of (002) layers in pyrite. Such a marcasite layer can be described as a boundary between two pyrite crystals that are related by a 2, screw axis parallel to [100]. Energy-dispersive X-ray spectrometry (EDS) indicates that such disordered pyrite crystals contain about 3 at% As. However, the distribution of As is uniform over heavily faulted and fault-free regions, indicating the As content is not related to the occurrence of marcasite lamellae in pyrite.

Original languageEnglish (US)
Pages (from-to)119-125
Number of pages7
JournalAmerican Mineralogist
Volume81
Issue number1-2
StatePublished - Jan 1996

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marcasite
pyrites
pyrite
crystal
Crystals
High resolution transmission electron microscopy
crystals
transmission electron microscopy
spherules
spherule
high resolution
screws
lamella
Model structures
Electron diffraction
diffraction
x ray spectroscopy
defect
spectrometry
Energy dispersive spectroscopy

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Structural relationship between pyrite and marcasite. / Dódony, István; Pósfai, Mihály; Buseck, P R.

In: American Mineralogist, Vol. 81, No. 1-2, 01.1996, p. 119-125.

Research output: Contribution to journalArticle

Dódony, I, Pósfai, M & Buseck, PR 1996, 'Structural relationship between pyrite and marcasite', American Mineralogist, vol. 81, no. 1-2, pp. 119-125.
Dódony, István ; Pósfai, Mihály ; Buseck, P R. / Structural relationship between pyrite and marcasite. In: American Mineralogist. 1996 ; Vol. 81, No. 1-2. pp. 119-125.
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