 |
 |
|
Paar, W. H., Moelo, Y., Mozgova, N. N., Organova, N. I., Stanley, C. J., Roberts, A. C., Culetto, F. J., Effenberger, H. S., Topa, D., Putz, H., Sureda, R. J. & de Brodtkorb, M. K. (2008) Coiraite, (Pb,Sn2+)(12.5)As3Fe2+Sn54+S28: a franckeite-type new mineral species from Jujuy Province, NW Argentina. Mineral. Mag. 72 1083–1101.
Added by: Laurent Cournède (2016-03-10 21:58:41) |
| Type de référence: Article DOI: 10.1180/minmag.2008.072.5.1083 Numéro d'identification (ISBN etc.): 0026-461X Clé BibTeX: Paar2008 Voir tous les détails bibliographiques  |
Catégories: CESES Mots-clés: arsenic, As-derivative of franckeite, coiraite, crystal-structure, cylindrite, cylindrite group, deposit, sulphosalt, tin Créateurs: de Brodtkorb, Culetto, Effenberger, Moelo, Mozgova, Organova, Paar, Putz, Roberts, Stanley, Sureda, Topa Collection: Mineral. Mag. |
Consultations : 1/492
Indice de consultation : 3% Indice de popularité : 0.75% |
| Résumé |
|
{Coiraite, ideally (Pb,Sn2+)(12.5)As3Fe2+Sn54+S28, occurs as an economically important tin ore in the large Ag-Sn-Zn polymetallic Pirquitas deposit, Jujuy Province, NW-Argentina. The new mineral species is the As derivative of franckeite and belongs to the cylindrite group of complex Pb sulphosalts with incommensurate composite-layered structures. It is a primary mineral, frequently found in colloforni textures, and formed from hydrothermal solutions at low temperature. Associated minerals are franckeite, cylindrite, pyrite-iliarcasite, as well as minor amounts of hocartite, Ag-rich rhodostannite, arsenopyrite and galena. Laminae of coiraite consist of extremely thin bent platy crystals up to 50 mu m long. Electron microprobe analysis (n = 31) gave an empirical formula Pb11.21As2.99Ag0.13 Fe1.10Sn6.13S28.0, close to the ideal formula (Pb11.3Sn1.22+)(Sigma=12.5)As3Fe2+Sn54+S28. Coiraite has two monoclinic sub-cells, Q (pseudotetragonal) and H (pseudohexagonal). Q: a 5.84(1) angstrom, b 5.86(1) angstrom, c 17.32(1) angstrom, beta 94.14(1)degrees, V 590.05(3) angstrom(3)
Added by: Laurent Cournède |