New data on gersdorffite and associated minerals from the Peloritani Mountains (Sicily, Italy)
Open Access
- 19 November 2021
- journal article
- research article
- Published by Copernicus GmbH in European Journal of Mineralogy
- Vol. 33 (6), 717-726
- https://doi.org/10.5194/ejm-33-717-2021
Abstract
Gersdorffite, ideally NiAsS, and associated minerals from Contrada Zillì (Peloritani Mountains, Sicily, Italy) have been characterized through electron microprobe analysis and X-ray diffraction. Primary minerals, hosted in quartz veins, are represented by gersdorffite, tetrahedrite-(Fe), and chalcopyrite with minor pyrite and galena. Rare aikinite inclusions were observed in tetrahedrite-(Fe) and chalcopyrite. Gersdorffite occurs as euhedral to subhedral crystals, up to 1 mm in size, with (Sb,Bi)-enriched cores and (Fe,As)-enriched rims. Its chemical composition is (Ni0.79−0.95Fe0.18−0.04Co0.04−0.01)(As0.90−1.03Sb0.10−0.00Bi0.02−0.00)S0.98−0.92. It crystallizes in the space group P213, with unit-cell parameters a=5.6968(7) Å, V=184.88(7) Å3, and Z=4, and its crystal structure was refined down to R1= 0.035. Associated tetrahedrite-(Fe) has chemical formula (Cu5.79Ag0.07)Σ5.86(Cu3.96Fe1.59Zn0.45)Σ6.00(Sb3.95As0.17Bi0.03)Σ4.15S13.06, with unit-cell parameters a= 10.3815(10) Å, V=1118.9(3) Å3, and space group I-43m. Its crystal structure was refined to R1=0.027. Textural and crystallographic data suggest a polyphasic crystallization of gersdorffite under low-temperature conditions.Keywords
Funding Information
- Ministero dell’Istruzione, dell’Università e della Ricerca (2017AK8C32)
This publication has 22 references indexed in Scilit:
- THE SYSTEM Fe Co Ni As S. II. PHASE RELATIONS IN THE (Fe,Co,Ni)As1.5S0.5 SECTION AT 650 AND 500 CThe Canadian Mineralogist, 2004
- Age, Geochemistry and Petrogenesis of the Ultramafic Pipes in the Ivrea Zone, NW ItalyJournal of Petrology, 2001
- Gersdorffite with pentlandite, violarite, pyrrhotite, and pyrite, northwest Nelson, New ZealandNew Zealand Journal of Geology and Geophysics, 1999
- Metamorphogenic barite-pyrite (Pb-Zn-Ag) veins at pollone, apuane alps, tuscany: vein geometry, geothermobarometry, fluid inclusions and geochemistryTschermaks Mineralogische und Petrographische Mitteilungen, 1998
- Hydrothermal Cu-Ni-Au-Ag mineralization in a granodiorite sill north of Cradock, Republic of South AfricaMineralium Deposita, 1997
- Bond-valence parameters for solidsActa crystallographica Section B, Structural science, crystal engineering and materials, 1991
- X-ray data, optical anisotropism, and thermal stability of cobaltite, gersdorffite, and ullmanniteMineralogical Magazine, 1969
- The crystal structure of gersdorffite (III), a distorted and disordered pyrite structureMineralogical Magazine and Journal of the Mineralogical Society, 1968
- The crystal structure of gersdorffiteMineralogical Magazine and Journal of the Mineralogical Society, 1967
- Le possibilita' minerarie della Provincia di MessinaPure and Applied Geophysics, 1940