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Vol. 55, No. 6, 2007 Clay mineralogy nomenclature 647 Table 1. Classification of planar hydrous phyllosilicates. Layer Interlayer material1 Group Octahedral Species2 type character 1:1 None or H2O only Serpentine-kaolin Trioctahedral Lizardite, berthierine, amesite, cronstedtite (x & 0) Dioctahedral Kaolinite, dickite, nacrite, halloysite (planar) Di,trioctahedral Odinite ———————————————————————————————— 2:1 None (x & 0) Talc-pyrophyllite Trioctahedral Talc, willemseite, kerolite, pimelite Dioctahedral Pyrophyllite, ferripyrophyllite Hydrated exchangeable Smectite Trioctahedral Saponite, hectorite, sauconite, stevensite, swinefordite cations (x & 0.2À0.6) Dioctahedral Montmorillonite, beidellite, nontronite, volkonskoite Hydrated exchangeable Vermiculite Trioctahedral Trioctahedral vermiculite cations (x & 0.6À0.9) Dioctahedral Dioctahedral vermiculite Non-hydrated mono- or Interlayer-deficient Trioctahedral Wonesite3,4 divalent cations mica Dioctahedral none4 (x & 0.6À0.85) Non-hydrated True (flexible) Trioctahedral Phlogopite, siderophyllite, aspidolite monovalent cations, mica Dioctahedral Muscovite, celadonite, paragonite (550% monovalent, x & 0.85À1.0 for dioctahedral) Non-hydrated divalent Brittle mica Trioctahedral Clintonite, kinoshitalite, bityite, anandite cations, (550% divalent, Dioctahedral Margarite, chernykhite x & 1.8À2.0) Hydroxide sheet Chlorite Trioctahedral Clinochlore, chamosite, pennantite, nimite, baileychlore (x = variable) Dioctahedral Donbassite Di,trioctahedral Cookeite, sudoite Tri,dioctahedral none ———————————————————————————————— 2:1 Regularly interstratified Variable Trioctahedral Corrensite, aliettite, hydrobiotite, kulkeite (x = variable) Dioctahedral Rectorite, tosudite, brinrobertsite 1:1, 2:1 Trioctahedral Dozyite 1 x is net layer charge per formula unit, given as a positive number 2 not an exhaustive list of species; in general, listed in order of abundance 3 net layer charge may be <0.6, but this is an exception 4 ‘series’ names are given in Rieder et al. (1998) as a convenient way to describe incompletely investigated micas. For example, biotite is a trioctahedral true-mica series name for certain dark micas that may be used as a field term, and illite is a dioctahedral interlayer-deficient series name to describe certain micas after only optical microscopic data become available. Other dioctahedral interlayer-deficient micas of a series type are glauconite and brammallite. CORRIGENDUM 2 In the paper ‘The influence of acid treatment on the composition of bentonite’ from Clays and Clay Minerals,vol.54 (2006), 699À704, by A. Vulkovic´ et al., in the list of authors, please replace Aleksandra Milutinovic´ with Aleksandra Milutinovic´-Nikolic´..

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An Evolutionary System of Mineralogy: Proposal for a Classification Of
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