This report deals with a general reexamination of the systematics of sulfosalts. It represents an update of the activity of the Sulfosalt Sub-Committee within the Commission on Ore Mineralogy of the International Mineralogical Association, in connection with the Commission on New Minerals, Nomenclature and Classification (CNMNC-IMA). Part I presents generali- ties of sulfosalt definition and nomenclature. After an extended chemical definition of sulfosalts, attention is focused on "classic" sulfosalts with As 3+ ,S b 3+ ,B i 3+ or Te 4+ as cations, corresponding to the general formula (Me + , Me' 2+ , etc.)x ((Bi, Sb, As) 3+ , Te 4+ )y ((S, Se, Te) 2− )z (Me, Me': various metals). General aspects of their chemistry and classification principles are summarized, especially with regard to chemical substitutions and modular analysis of complex crystal structures. On this basis, Part II presents a review of sulfosalt systematics. Six main crystal-chemical sub-groups are distinguished (plus some unclassified species), con- cerning more than 220 valid mineral species. Among others whose status is questioned are those considered to be varieties of well-defined species; minerals with ill-defined X-ray data; those that are possibly identical species; and those that represent the potential revalidation of old species. More than 50 crystal structures still remain unsolved, among which about a half probably corresponds to new structure types.

/pdf/sulfosalt-systematics-a-review-report-of-the-sulfosalt-sub-4ov8zelif8.pdf

Sulfosalt systematics: a review. Report of the sulfosalt sub-committee of the IMA Commission on Ore Mineralogy

Different degrees of similarity between inorganic crystal structures are defined concisely and examples are presented that illustrate their practical application. A notation giving the coordination of atoms is presented together with some basic rules for developing crystal-chemical formulae and the Bauverband description of inorganic structure types. Typical examples of the nomenclature are: pyrite Fe[6°]{g}[S2(3;1)t], [F(□2l) + F′FeS2Pa\bar 3; spinel Mg[4]AI2[6]O4, ∞3[Mg[4t]lAl2[6o]O4[l,3;12co]], Fm222 + D, T′ MgAI2O4 Fd\bar 3m.

/pdf/nomenclature-of-inorganic-structure-types-report-of-the-1mn3rmuemm.pdf

Nomenclature of inorganic structure types. Report of the International Union of Crystallography Commission on Crystallographic Nomenclature Subcommittee on the Nomenclature of Inorganic Structure Types

Metal chalcogenide cluster chemistry

Misfit layer compounds (MS)nTS2 (M = Sn, Pb, Bi, rare earth elements: T = Nb, Ta ; n = 1.08 – 1.19), a new class of layer compounds

The crystal structure of tveitite, an ordered yttrofluorite mineral

We consider incommensurate structures of the type which have two more or less independent, though modulated, sub-lattices derived from misfitting layers of two types, alternating regularly in the layer-stacking direction. These are the two-dimensional analogues of the so-called “chimney-ladder” structures (which are one-dimensional).

Non-commensurate (misfit) layer structures

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Non-commensurate (misfit) layer structures