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European Journal of Mineralogy; August/September; v. 21; no. 4; p. 673-690; DOI: 10.1127/0935-1221/2009/0021-1937
© 2009 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

A survey of hybrid twins in non-silicate minerals

Massimo Nespolo1,* and Giovanni Ferraris2

1 CRM2, UMR-CNRS 7036, Institut Jean Barriol, Faculté des Sciences et Techniques, Nancy-Université, BP 70239, Boulevard des Aiguillettes, 54506 Vandœuvre-lès-Nancy, France
2 Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, via Valperga Caluso 35, 10125 Torino, Italy

* Corresponding author, e-mail: massimo.nespolo{at}crm2.uhp-nancy.fr

Hybrid twins are twins in which two or more concurrent sublattices based on the same twin element exist. Each sublattice contributes, with its twin index and obliquity, to the overall degree of lattice restoration, which is measured by the effective twin index nE, a generalization of the classical twin index. A systematic analysis of twins in the following non-silicate minerals is presented and the hybrid nature of several of them is pointed out: apatite, anhydrite, aragonite, aramayoite, arsenic, atacamite, baddeleyite, becquerelite, bellingerite, brookite, butlerite, calcite, cassiterite, celestine, chalcostibite, corundum, cryolite, derbylite, diaphorite, dolomite, euxenite-(Y), columbite-(Fe) (also known as ferrocolumbite), glaucodot, gudmundite, gypsum, haindingerite, hausmannite, hematite, ilmenite, iodargyrite, linarite, kotoite, marcasite, maucherite, metarossite, millerite, monazite, nickeline, nitratine, proustite, pyrargyrite, raspite, sassolite, scorzalite, stannite, symplesite, ulexite, xenotime-(Y).

Key-words: twin description, hybrid twinning, reticular merohedry, polyholohedry, effective twin index, concurrent (quasi)-restored sublattices.






JOURNAL HOME HELP FEEDBACK/COMMNET SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers