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Book Chapter

Structures and microstructures of non-classical pyriboles

By
Krassimir N. Bozhilov
Krassimir N. Bozhilov
Central Facility for Advanced Microscopy and Microanalysis, Earth Science Department, University of California Riverside, CA 92521, USA
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Published:
January 01, 2013

Abstract

Non-classical pyriboles (NCP) represent a complex group of related mineral phases that range structurally and compositionally between pyroxenes and mica. They are characterized by tetrahedral silicate chain multiplicity other than single or double, and typically occur as polysomatic lamellar intergrowths between themselves and/or with pyroxenes and amphiboles in diverse geological environments including regional and contact-metamorphosed ultramafic, mafic and ocean-floor rocks and hydrothermally altered sediments. The study of fine lamellar aggregates of NCPs is complicated further by the presence of extensive and diverse microstructures such as stacking and chain multiplicity faults, dislocations, chain terminations, and polysomatic and polytypic disorder. Proper characterization of pyriboles necessitates utilization of local atomic-scale resolution techniques such as electron microscopy, including high-resolution transmission electron microscopy (HRTEM), electron diffraction and microanalysis.

This chapter reviews the major concepts that govern the structural and crystal-chemical properties of NCP following the principles introduced by Thompson (1970, 1978). Summary information is assembled here about the progress that has been made over the past 20 years regarding the structures and microstructures, modes of occurrence, methods of characterization and synthesis of NCP. Further, the role of poly-somatic disorder in the extent and interpretation of solid solution among pyribole end-members is assessed critically.

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Contents

European Mineralogical Union Notes in Mineralogy 14

Minerals at the Nanoscale

F. Nieto
F. Nieto
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K.J.T. Livi
K.J.T. Livi
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R. Oberti
R. Oberti
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Mineralogical Society of Great Britain and Ireland
ISBN electronic:
9780903056380
Publication date:
January 01, 2013

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