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Structure of framboidal pyrite; a single crystal X-ray diffraction study

Hiroaki Ohfuji, David Rickard, Mark E. Light and Michael B. Hursthouse
Structure of framboidal pyrite; a single crystal X-ray diffraction study
European Journal of Mineralogy (February 2006) 18 (1): 93-98

Abstract

The study of self-assembled nature of pyrite framboids by single-crystal XRD showed that even morphologically well organized framboids are not extreme examples of single crystals but are microcrystalline aggregates. Two-dimensional diffraction patterns from well-organized framboids of relatively few ( approximately 1000) microcrystals are single-crystal-like but are actually produced by the superimposition of XRD reflections from similarly, but not identically, oriented microcrystals. The number of coherent cystallographic orientations of pyrite crystals estimated from a complete Ewald sphere data set, obtained from a larger single framboid, were found to be around 4-5 times fewer than the number of microcrystals that are actually contained in the framboid. The results indicate the presence of multiple single-crystal-like domains arranged in similar crystallographic orientations. Thus framboids are not formed by a process in which crystallographic control is a primary factor. Framboid self-assembly is probably caused by the aggregation of a large number of similarly sized and shaped pyrite microcrystals that are nucleated in a limited volume. Self-organization occurs as these microcrystals adopt a minimum energy configuration.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 18
Serial Issue: 1
Title: Structure of framboidal pyrite; a single crystal X-ray diffraction study
Affiliation: Cardiff University, School of Earth, Ocean and Planetary Sciences, Cardiff, United Kingdom
Pages: 93-98
Published: 200602
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 16
Accession Number: 2006-036663
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: University of Southampton, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200620
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