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Orpiment from
Carrara, Massa-Carrara Province, Tuscany, Italy

Locality type:Commune
Classification
Species:Orpiment
Formula:As2S3
Comments:Described by D'Achiardi (1899 and 1905) and Giampaoli as an alteration product of realgar, in the form of thin yellow scales and orange-yellow spots on the former. The yellow to yellow-orange mineral described by these two authors, and later mentioned by other authors, is actually pararealgar. In fact, orpiment cannot derive from the alteration of realgar, that usually alters into pararealgar (e.g., Bonazzi et al., 2006). Consequently, the occurrence of orpiment from the cavities of the Carrara marble has to be considered as questionable (Biagioni et al., 2019).
Confirmation
Validity:Unconfirmed/Questioned
References
References:D'Achiardi, G. (1899) Minerali dei marmi di Carrara (Nota preventiva). Atti della Società Toscana di Scienze Naturali, Processi Verbali, 11, 160-163; D’Achiardi, G. (1905) I minerali dei marmi di Carrara. Parte II. Atti della Società Toscana di Scienze Naturali, Memorie, 21, 236-264 (Parte II); Giampaoli, A. (1905) I minerali accessori dei marmi di Carrara. Carrara; Orlandi, P., Bracci, G., Dalena, D., Duchi, G., and Vezzalini, G. (1980) I minerali delle geodi della formazione marmifera di Carrara. Atti della Società Toscana di Scienze Naturali, Memorie, serie A, 87, 93-124; Franzini, M., Orlandi, P., Bracci, G., and Dalena, D. (1982) I minerali del marmo di Carrara. Rivista Mineralogica Italiana Ed., Milano, 110 pp.; Orlandi, P., and Franzini, M. (1994) I minerali del marmo di Carrara. Cassa di Risparmio di Carrara - Amilcare Pizzi Editore S.p.A., Milano, 109 pp.; Bonazzi, P., Bindi, L., Pratesi, G., and Menchetti, S. (2006) Light-induced changes in molecular arsenic sulfides: state of the art and new evidence by single-crystal X-ray diffraction. American Mineralogist, 91, 1323-1330; Orlandi, P., and Criscuolo, A. (2009) Minerali del marmo delle Alpi Apuane. Parco delle Alpi Apuane - Pacini Editore, Ospedaletto-Pisa, 180 pp.; Biagioni, C., Orlandi, P., Camarda, S., Chinellato, M., Appiani, R., Del Chiaro, L., and Sanguineti, G. (2019) Minerals from marbles of Carrara and the Apuan Alps. LoGisma editore, Vicchio (Firenze) - Musumeci S.p.A., Quart (Aosta), 144 pp.
Data
Mineral Data:Click here to view Orpiment data
Locality Data:Click here to view Carrara, Massa-Carrara Province, Tuscany, Italy
 
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