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A survey of hybrid twins in silicate minerals

Abstract : This article is the second part of the survey presenting a systematic crystallographic analysis of hybrid twins inminerals. Here we deal with silicate minerals and in particular the hybrid twins of allanite, augite, axinite, beryl, chloritoid, clinoenstatite, clinozoisite, cordierite, cummingtonite-grunerite, diopside-hedenbergite, enstatite-ferrosilite, epidote, forsterite-fayalite, johannsenite, natrolite, piemontite, pigeonite, protoenstatite, pumpellyite, pyroxmangite, quartz, titanite, spodumene, staurolite, topaz, tourmaline, tremoliteactinolite-ferroactinolite, tridymite. The comparison with the twin analysis of non-silicate minerals shows that the number of hybrid twins for non-silicates is higher than that of the silicates. This well agrees with the fact that the twin formation is favoured by the high symmetries of the close-packing topologies, typical of many non-silicates, especially oxides and simple sulphides, whereas the silicate structures are more complex and characterized by different degrees of polymerization of Si-O tetrahedra.
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Submitted on : Sunday, February 18, 2018 - 2:49:23 PM
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Isabella Pignatelli, Massimo Nespolo, Giovanni Ferraris. A survey of hybrid twins in silicate minerals. European Journal of Mineralogy, Copernicus, 2011, 23 (5), pp.779 - 794. ⟨10.1127/0935-1221/2011/0023-2142⟩. ⟨hal-01711520⟩



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