Original paper

Rosiaite, PbSb2O6, a new mineral from the Cetine mine, Siena, Italy

Basso, Riccardo; Lucchetti, Gabriella; Zefiro, Liviο; Palenzona, Andrea

European Journal of Mineralogy Volume 8 Number 3 (1996), p. 487 - 492

23 references

published: Jun 17, 1996
manuscript accepted: Jan 31, 1996
manuscript received: Nov 14, 1995

DOI: 10.1127/ejm/8/3/0487

BibTeX file

ArtNo. ESP147050803003, Price: 29.00 €

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Abstract

Abstract Rosiaite occurs at the Cetine di Cotorniano mine, formerly named Rosia mine, associated with valentinite, tripuhyite, bindheimite and a phase corresponding to the synthetic ß-Sb2O4 polymorph of cervantite. Rosiaite, appearing generally as aggregates of minute tabular {0001} crystals with hexagonal outline, is colourless to pale yellow, transparent, optically uniaxial negative and nonpleochroic with ω = 2.092(2) and 8 = 1.920(10). Microprobe analyses reveal a good compositional homogeneity and a quasi-ideal composition. The strongest lines in the powder pattern are d101 = 3.49 Å and d110 = 2.648 Å. The crystal structure, described in the space group P3 1m with a = 5.295(1) Å, c = 5.372(1) Å and Z = 1, has been refined to R = 0.033, confirming the new mineral to be the natural analogue of synthetic PbSb2O6 studied previously. The approximately hexagonal close-packed structure of rosiaite shows a pattern of occupied octahedral sites identical to that of synthetic compounds such as Li2ZrF6, Li2NbOF5 and several double hexaoxides, containing Sb or As.

Keywords

rosiaitenew mineralphysical and chemical datapowder patternstructure refinement