THE CRYSTAL STRUCTURE OF GUETTARDITE, PbAsSbS4, AND THE TWINNITE-GUETTARDITE PROBLEM

Makovicky, Emil; Topa, Dan; Tajjedin, Husein; Rastad, Ebrahim; Yaghubpur, Abdolmajid

doi:10.3749/canmin.50.2.253

Cited by 14 publications

(1 citation statement)

References 16 publications

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“…Correspondingly, twinnite Pb0.8Tl0.1As0.8Sb1.3S4 has only 1.96 wt. % Tl and guettardite, Pb1.02Sb1.11As0.81S4.06 [39] and Pb0.95-0.96Sb0.96-1.02As1.03-1.06S4 [40] is Tl-free. However, the structurally not analyzed guettardite from Jas Roux, associated with écrinsite, pierrotite, and chabournéite has the electron microprobe composition Tl0.31Pb7.58Sb7.46As8.71S31.95.…”

Section: The Crystal Chemical Formula Is Me + X Me 2+mentioning

confidence: 99%

Modular Crystal Chemistry of Thallium Sulfosalts

Makovicky

2018

Minerals

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Complex sulfides of thallium with As, Sb, or Bi and with other cations (‘thallium sulfosalts’) are a large group of crystal structures with extreme variability. Incorporation of the large Tl+ cation in them is solved in several different ways: housing of Tl in columns of capped trigonal coordination prisms, which form separate walls in the structure (in different combinations with Pb and/or Sb), regular alternation of large Tl with small cations (As), presence of structural arrays of Tl coordination polyhedra paralleled by arrays of As coordination pyramids with a frequency ratio 1:2, omission derivatives with cavities for Tl accommodation and formation of layer structures with thallium concentrated into separate (inter)layers of different types. The first principle leads to a large family of sartorite homologues and rare lillianite homologues, as well as to the chabournéite group. The second one to the hutchinsonite family, omission derivatives form the routhierite and galkhaite groups, and the 1:2 periodicity ratio principle results in several outstanding structures from different groups. Layer structures consist of two-component and three-component layer combinations. Close cation-cation interactions are present but rare.

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Section: The Crystal Chemical Formula Is Me + X Me 2+mentioning

confidence: 99%