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Biagioni, C., Bnaccorsi, E., Pasero, M., Moelo, Y., Ciriotti, M. E., Bersani, D., Callegari, A. M. & Boiocchi, M. (2011) Ambrinoite, (K,NH4)(2)(As,Sb)(8)S-13 center dot H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: The first natural (K,NH4)-hydrated sulfosalt. Am. Miner. 96 878–887. 
Added by: Laurent Cournède (2016-03-10 21:32:20)
Type de référence: Article
DOI: 10.2138/am.2011.3723
Numéro d'identification (ISBN etc.): 0003-004X
Clé BibTeX: Biagioni2011
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Catégories: MIOPS
Mots-clés: Ambrinoite, ammonium, county, crystal structure, crystal-structure, galkhaite, gerstleyite, gillulyite, Italy, mercur gold deposit, organic inclusions, Piedmont, potassium, raman-spectra, sb)(8)s-13, Signols, structural-characterization, sulfosalt, tl-2(as, Torino, Upper Susa Valley
Créateurs: Bersani, Biagioni, Bnaccorsi, Boiocchi, Callegari, Ciriotti, Moelo, Pasero
Collection: Am. Miner.
Consultations : 20/1188
Indice de consultation : 4%
Indice de popularité : 1%
Résumé     
{Ambrinoite, ideally (K,NH4)(2)(As,Sb)(8)S-13 center dot H2O, occurs as a rare sulfosalt species in the Triassic evaporitic formation of Gessi (gypsum) outcropping near the hamlet of Signols (Oulx, Susa Valley, Torino, Piedmont, Italy). The new species is associated with sulfur and orpiment; in the same occurrence galkhaite, stibnite, and enargite were also identified. Ambrinoite occurs as aggregates of tabular crystals up to 1 mm in length. The color is red, with an orange-red streak; the luster is vitreous to resinous. The mineral is transparent; its microhardness VHN(10 g) = 30 kg/mm(2), corresponding to a Mohs hardness of about 2. Electron microprobe analysis gives the empirical formula [K-1.43(NH4)(0.42)Na0.02Tl0.01](Sigma=1.88) (As5.82Sb2.18)(Sigma=8.00)S-13.22 center dot 1.2H(2)O, close to stoichiometric [K-1.5(NH4)(0.5)](Sigma=2)(As6Sb2)(Sigma=8)S-13 center dot H2O; the calculated density is 3.276 g/cm(3). Micro-Raman spectroscopy confirmed the presence of water and ammonium cation. Ambrinoite is triclinic, space group P (1) over bar, with a = 9.704(1)
Added by: Laurent Cournède  
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