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Ni-sulphides from the Bottino Mine (Tuscany, Italy)

Marco Benvenuti
Ni-sulphides from the Bottino Mine (Tuscany, Italy)
European Journal of Mineralogy (February 1991) 3 (1): 79-84


The Pb-Ag(Zn) mineralization at Bottino (Tuscany, Italy) include several late-stage Ni-sulphides, such as gersdorffite, ullmannite, pentlandite, and argentopentlandite (first report for Italy). The occurrence of Ni-enriched cores within earlier arsenopyrite crystals is also distinctive. Gersdorffite and ullmannite may be commonly observed both as isolated subhedral crystals and as rims around early-formed sulphides. Flames of pentlandite within pyrrhotite are suggestive of exsolution from Fe-Ni-S "mss" (monosulphide solid solution). Argentopentlandite is disposed along the margins of chalcopyrite aggregates. Its composition Fe (sub 4.78) Ni (sub 3.07) AgS (sub 8) compares well with that commonly reported for argentopentlandites. It is not clear whether argentopentlandite at Bottino is due to exsolution from a Ag-bearing Cu-Fe-S "iss" or, alternatively, to replacement processes. The core-to-rim decrease in Ni contents within arsenopyrites, and the late-stage deposition of separate Niphases are interpreted that, as temperature decreased, Ni could be no longer accommodated into the lattices of phases such as arsenopyrite (and/or mss and/or iss). Thermochemical features of the Bottino Ni-sulphides are consistent with deposition at temperatures of about 350-400 degrees C and relatively low sulfur fugacities.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 3
Serial Issue: 1
Title: Ni-sulphides from the Bottino Mine (Tuscany, Italy)
Author(s): Benvenuti, Marco
Affiliation: Univ. Firenze, Dep. Sci. Terra, Florence, Italy
Pages: 79-84
Published: 199102
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 22
Accession Number: 1994-052602
Categories: Economic geology, geology of ore depositsMineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 199424
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