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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Europe
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Southern Europe
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Italy
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Apennines
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Apuane Alps (1)
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Sicily Italy
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Lipari Islands
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Vulcano (1)
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Tuscany Italy
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Apuane Alps (1)
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Thrace (1)
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Western Europe
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France
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Tarn France (1)
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South America
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Argentina
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Jujuy Argentina (1)
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Bolivia (1)
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commodities
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metal ores
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silver ores (1)
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tin ores (1)
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elements, isotopes
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metals
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antimony (2)
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arsenic (2)
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bismuth (3)
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indium (1)
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iron (1)
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lead (3)
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platinum group (1)
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tin (3)
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selenium (1)
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minerals
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arsenides
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carbonates (1)
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halides
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chlorides (1)
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platinum minerals (1)
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silicates
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orthosilicates
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sorosilicates
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melilite (1)
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sulfides
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bismuthinite (1)
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chalcopyrite (1)
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covellite (1)
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heazlewoodite (1)
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kesterite (2)
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mackinawite (1)
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pyrite (1)
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sphalerite (1)
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tochilinite (1)
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valleriite (1)
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sulfosalts
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sulfantimonates
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cylindrite (3)
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sulfantimonites
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polybasite (1)
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zinckenite (1)
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sulfarsenites
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pearceite (1)
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tennantite (1)
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tellurides
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calaverite (1)
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Primary terms
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crystal chemistry (6)
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crystal growth (1)
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crystal structure (8)
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data processing (1)
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Europe
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Southern Europe
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Italy
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Apennines
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Apuane Alps (1)
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Sicily Italy
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Lipari Islands
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Vulcano (1)
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-
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Tuscany Italy
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Apuane Alps (1)
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-
-
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Thrace (1)
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Western Europe
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France
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Tarn France (1)
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-
-
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metal ores
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silver ores (1)
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tin ores (1)
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metals
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antimony (2)
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arsenic (2)
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bismuth (3)
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indium (1)
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iron (1)
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lead (3)
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platinum group (1)
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tin (3)
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selenium (1)
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South America
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Argentina
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Jujuy Argentina (1)
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Bolivia (1)
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levyclaudite
La levyclaudite, Pb 8 Sn 7 Cu 3 (Bi,Sb) 3 S 28 , une nouvelle espece a structure incommensurable, de la serie de la cylindrite
Crystal structure of a synthetic tin-selenium representative of the cylindrite structure type
STRUCTURES AND CLASSIFICATION OF INDIUM SULFOSALTS, AND THE CRYSTAL STRUCTURE OF Sn 12 In 19 (Se,S) 41
The crystal structure of franckeite, Pb 21.7 Sn 9.3 Fe 4.0 Sb 8.1 S 56.9
Tubulite, ~Ag 2 Pb 22 Sb 20 S 53 , a new Pb–Ag–Sb sulfosalt from Le Rivet quarry, Peyrebrune ore field (Tarn, France) and Biò, Borgofranco mines, Borgofranco d’Ivrea (Piedmont, Italy)
The crystal structure of vurroite, Pb 20 Sn 2 (Bi, As) 22 S 54 Cl 6 : OD-character, polytypism, twinning, and modular description
Lead-antimony sulfosalts from Tuscany (Italy). XXII. Marcobaldiite, ∼Pb 12 (Sb 3 As 2 Bi) Σ6 S 21 , a new member of the jordanite homologous series from the Pollone mine, Valdicastello Carducci
Coiraite, (Pb,Sn 2+ ) 12.5 As 3 Fe 2+ \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{Sn}_{5}^{4+}\) \end{document} S 28 :a franckeite-type new mineral species from Jujuy Province, NW Argentina
Lillianites and andorites: new life for the oldest homologous series of sulfosalts
The three-dimensional periodic nature of crystalline structures was so strongly anchored in the minds of scientists that the numerous indications that seemed to question this model struggled to acquire the status of validity. The discovery of aperiodic crystals, a generic term including modulated, composite and quasicrystal structures, started in the 1970s with the discovery of incommensurately modulated structures and the presence of satellite reflections surrounding the main reflections in the diffraction patterns. The need to use additional integers to index such diffractograms was soon adopted and theoretical considerations showed that any crystal structure requiring more than three integers to index its diffraction pattern could be described as a periodic object in a higher dimensional space, i.e. superspace, with dimension equal to the number of required integers. The structure observed in physical space is thus a three-dimensional intersection of the structure described as periodic in superspace. Once the symmetry properties of aperiodic crystals were established, the superspace theory was soon adopted in order to describe numerous examples of incommensurate crystal structures from natural and synthetic organic and inorganic compounds even to proteins. Aperiodic crystals thus exhibit perfect atomic structures with long-range order, but without any three-dimensional translational symmetry. The discovery of modulated structures was soon followed by the discovery of composite structures consisting of structural entities with partly independent translations and finally by the discovery of quasicrystals. In recent years, the use of CCD and imaging plate systems improved considerably the sensitivity of data collection for aperiodic structures and in particular modulated structures and, therefore, there was a need for further improvement of the methods. Today, several computer programs are able to solve and refine incommensurately modulated structures using the superspace approach. In nature, it is uncommon to find minerals which have strong and sharp incommensurate satellites that could be used for a higher dimensional refinement. Here we describe several cases of aperiodic minerals (natrite, calaverite, melilite, fresnoite, pearceite–polybasite, cylindrite) including the first examples of natural and stable quasicrystalline structures (icosahedrite and decagonite) which settle beyond doubt any questions which remain about the long-term stability of quasicrystals.