Articles | Volume 36, issue 5
https://doi.org/10.5194/ejm-36-863-2024
https://doi.org/10.5194/ejm-36-863-2024
Research article
 | 
19 Sep 2024
Research article |  | 19 Sep 2024

Bonacinaite, Sc(AsO4)  ⋅  2H2O, the first scandium arsenate

Marco E. Ciriotti, Uwe Kolitsch, Fernando Cámara, Pietro Vignola, Frédéric Hatert, Erica Bittarello, Roberto Bracco, and Giorgio Maria Bortolozzi

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Cited articles

Ardit, M., Phillips, B. L., and Bish, D. L.: Crystal structure determination of orthorhombic variscite 2O and its derivative AlPO4 structure at high temperature, Am. Mineral., 107, 1385–1395, 2022. 
Baldelli, C., Dal Piaz, G. V., and Polino, R.: Le quarziti a manganese e cromo di Varenche-St. Barthélemy, una sequenza di copertura oceanica della falda piemontese, Ofioliti, 8, 207–221, 1983 (in Italian). 
Barresi, A. A., Kolitsch, U., Ciriotti, M. E., Ambrino, P., Bracco, R., and Bonacina, E.: La miniera di manganese di Varenche (Aosta, Italia Nord-Occidentale): ardennite, arseniopleite, manganberzeliite, pirofanite, sarkinite, sursassite, thortveithite, nuovo As-Sc-analogo della metavariscite e altre specie, Micro, 3, 81–122, 2005 (in Italian with English, French and German abstracts). 
Barresi, A. A., Kolitsch, U., Ciriotti, M. E., Ambrino, P., Bracco, R., and Bonacina, E.: Errata corrige: Varenche, Micro, 5, 180, 2007a (in Italian). 
Barresi, A. A., Orlandi, P., and Pasero, M.: History of ardennite and the new mineral ardennite-(V), Eur. J. Mineral., 19, 581–587, https://doi.org/10.1127/0935-1221/2007/0019-1745, 2007b. 
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The article provides the standard description of bonacinaite, Sc3+(AsO4)·2H2O, the first natural scandium arsenate. The new mineral species was found in a few specimens in the dumps of the old Varenche Mine, Valle d'Aosta, Italy, which is therefore the type locality and the only locality in the world. Bonacinaite forms colourless (with faint to distinct violet tints), pseudohexagonal, thick tabular crystals, up to 0.25 mm in size, or as small, faintly violet lath-shaped crystals.
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