TY - JOUR
T1 - Occurrence of new phosphides and sulfides of Ni, Co, V, and Mo from chromitite of the Othrys ophiolite complex (Central Greece)
AU - Zaccarini, Federica
AU - Ifandi, Elena
AU - Tsikouras, Basislios
AU - Grammatikopoulos, Tassos
AU - Garuti, Giorgio
AU - Mauro, Daniela
AU - Bindi, Luca
AU - Stanley, Chris
PY - 2019/12/2
Y1 - 2019/12/2
N2 - Unnamed phosphides of Ni, Co, V, Mo, and one V-sulfide were found in a chromitite of the Agios Stefanos mine (Othrys ophiolite, Central Greece). Most of the phosphides have a stoichiometry similar to allabogdanite or barringerite but show significant proportions of Co, V, and Mo. The minerals could correspond to a Ni-allabogdanite or Ni-barringerite, and to a V-allabogdanite or V-barringerite. More complex stoichiometries are observed when Mo is the dominant metal, and thus it leads to a potentially new (Mo,V,Fe)
3(Ni,Co)
2P mineral. The sulfide corresponds to the ideal formula VS. All the grains vary in size between 5 and 80 μm, and show distinctive reflectance and optical properties. In contrast, Raman spectra are not significantly distinctive. The rare minerals occur intergrown with brecciated chromite, awaruite, and various sulfides produced by alteration of chromitite under reducing conditions. Interpretation of their origin is still speculative embracing a number of possible processes: i) high-temperature reaction of the chromitites with reducing fluids, at mantle depth, ii) low-temperature alteration during serpentinization, iii) post-orogenic, surface lightning strike, or iv) meteorite impact. The minerals described in this work potentially represent new mineral species that are still under study for a complete crystallographic characterization, as required for the acceptance by the IMA Commission on New Minerals, Nomenclature and Classification.
AB - Unnamed phosphides of Ni, Co, V, Mo, and one V-sulfide were found in a chromitite of the Agios Stefanos mine (Othrys ophiolite, Central Greece). Most of the phosphides have a stoichiometry similar to allabogdanite or barringerite but show significant proportions of Co, V, and Mo. The minerals could correspond to a Ni-allabogdanite or Ni-barringerite, and to a V-allabogdanite or V-barringerite. More complex stoichiometries are observed when Mo is the dominant metal, and thus it leads to a potentially new (Mo,V,Fe)
3(Ni,Co)
2P mineral. The sulfide corresponds to the ideal formula VS. All the grains vary in size between 5 and 80 μm, and show distinctive reflectance and optical properties. In contrast, Raman spectra are not significantly distinctive. The rare minerals occur intergrown with brecciated chromite, awaruite, and various sulfides produced by alteration of chromitite under reducing conditions. Interpretation of their origin is still speculative embracing a number of possible processes: i) high-temperature reaction of the chromitites with reducing fluids, at mantle depth, ii) low-temperature alteration during serpentinization, iii) post-orogenic, surface lightning strike, or iv) meteorite impact. The minerals described in this work potentially represent new mineral species that are still under study for a complete crystallographic characterization, as required for the acceptance by the IMA Commission on New Minerals, Nomenclature and Classification.
UR - http://www.scopus.com/inward/record.url?scp=85067027378&partnerID=8YFLogxK
U2 - 10.2451/2019PM851
DO - 10.2451/2019PM851
M3 - Article
SN - 0369-8963
VL - 88.2019
SP - 105
EP - 119
JO - Periodico di Mineralogia
JF - Periodico di Mineralogia
IS - 3
ER -