Details

Autor(en) / Beteiligte

• Biagioni, Cristian
• Zaccarini, Federica
• Roth, Philippe
• Bindi, Luca

Titel

Progress in the knowledge of ‘ruby silvers’: New structural and chemical data of pyrostilpnite, Ag 3 SbS 3

Ist Teil von

• Mineralogical magazine, 2020-06, Vol.84 (3), p.463-467

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract The crystal structure of pyrostilpnite from the Plaka mine, Lavrion Mining District, Greece, was refined in the space group P 2 1 / c to a final R 1 index of 0.0283 on the basis of 2047 reflections with F o > 4σ( F o ) and 65 refined parameters. Unit-cell parameters of the crystal examined are a = 6.8629(6), b = 15.8800(14), c = 6.2711(5) Å, β = 117.087(2)°, V = 608.48(9) Å 3 and Z = 4. Chemical data agree with the stoichiometric formula Ag 3 SbS 3 . The crystal structure reported previously was confirmed, although a higher precision of refinement was achieved. It can be described as formed by {010} slabs running along c and connected along a through relatively longer Ag–S bonds. The analysis of the atomic displacement parameters together with a refinement with higher order tensors in the expression of the structure factors revealed no hint for pyrostilpnite as an ionic conductor. A historical background of the ‘ruby silvers’ is also reported.