Argentoliveingite, Ag<sub>3+x</sub>Pb<sub>36-2x</sub>A<sub>51+x</sub>S<sub>112</sub> (0 ≤ x < 0.5), a new homeotype of liveingite from Lengenbach, Binntal, Switzerland, and the crystal chemistry of the liveingite group
- Autor(en)
- Dan Topa, Uwe Kolitsch, Stefan Graeser, Emil Makovicky, Chris Stanley
- Abstrakt
Argentoliveingite, ideally Ag3+xPb36-2xAs51+xS112 (0 2Pb(2+) substitution. The density, 5.23 g cm(-3), was calculated using the empirical formula. Argentoliveingite is triclinic, space group P (no. 2), with a = 7.905(2), b = 8.469(2), c = 137.96(4) angstrom, alpha = 89.592(2), beta = 88.969(2), gamma = 89.893(2)degrees, V = 9235(5) angstrom(3) and Z = 2. The c axis is double the b axis of liveingite and represents the longest unit-cell parameter for a known natural sulphosalt. The strongest five lines in the (calculated) powder-diffraction pattern are [d in angstrom(I)(h,k,l)]: 3.781(85)((2) over bar ,0,10), 3.668(100)((1) over bar ,0,33), 3.553(83)(1,0,35), 3.009(91)((1) over bar ,2,27) and 2.938(94)(1,(2) over bar ,29). Argentoliveingite is a homeotype of liveingite and a new member of the sartorite homologous series with N = 3.67, and with a limited extent of the uncoupled substitutions of [Ag+ + As3+] for 2Pb(2+) and [Tl+ + As3+] for 2Pb(2+). In argentoliveingite the sequence of alternating N = 3 and N = 4 slabs is different from that in liveingite and is further modified by alternation of three, chemically distinct, types of N = 4 slabs. The length and arrangement of crankshaft chains of short As-S bonds differ between different slabs, and especially between the N = 4 slabs of liveingite and argentoliveingite. The crystal structures of liveingite and Ag-bearing liveingite (both quantitatively analysed) have been refined for comparison purposes. The uncertain relationship with the phase "rathite-IV" is discussed.
- Organisation(en)
- Institut für Mineralogie und Kristallographie
- Externe Organisation(en)
- Universität Basel, Naturhistorisches Museum Wien (NHM), University of Copenhagen, Natural History Museum London
- Journal
- European Journal of Mineralogy: an international journal of mineralogy, geochemistry and related sciences
- Band
- 31
- Seiten
- 1079-1097
- Anzahl der Seiten
- 19
- ISSN
- 0935-1221
- DOI
- https://doi.org/10.1127/ejm/2019/0031-2890
- Publikationsdatum
- 09-2019
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105116 Mineralogie, 105113 Kristallographie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Geochemistry and Petrology
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/f64185f7-d4cb-4d1c-aff0-203eafb2a839