Panskyite, Pd9Ag2Pb2S4, a new platinum group mineral from the Southern Kievey ore occurrence of the Fedorova–Pana layered intrusion, Kola Peninsula, Russia. (21st April 2021)

• Record Type: Journal Article
• Authors: Vymazalová, Anna; Subbotin, Viktor V.; Laufek, František; Savchenko, Yevgeny E.; Stanley, Chris J.; Gabov, Dmitriy A.; Plášil, Jakub
• Is Part Of: Mineralogical magazine. Volume 85:Number 2(2021)
• Page Start: 161
• Page End: 171
• Publication Date: 2021-04-21
• Subjects: panskyite, -- platinum-group mineral, -- Pd9Ag2Pb2S4, -- Fedorova–Pana layered intrusion, -- Kola Peninsula, -- Russia; Mineralogy -- Periodicals; Mineralogy -- Great Britain -- Periodicals; 549.05
• DOI: 10.1180/mgm.2020.100
• Languages: English
• ISSNs: 0026-461X

Abstract

Abstract: Panskyite, Pd9 Ag2 Pb2 S4, is a new mineral (IMA2020–039) discovered in the platinum-group element mineralisation of the Southern Kievey ore occurrence of the Fedorova–Pana layered intrusion, Kola Peninsula, Russia. It forms tiny anhedral grains (of 0.5 to 10 μm in size) in the interstices of rock-forming silicates, often forming tiny inclusions in base-metal sulfides (millerite, chalcopyrite, bornite and chalcocite) and complex intergrowths with other platinum group minerals (zvyagintsevite, laflammeite, vysotskite, thalhammerite, unnamed phase Pd9 Ag2 (Tl, Pb)2 S4 and others). In plane-polarised light, panskyite is creamy white with weak bireflectance, weak pleochroism and distinct anisotropy with brown to grey rotation tints; it exhibits no internal reflections. Reflectance values for panskyite in air ( R 1, R 2 in %) are: 43.8, 44.1 at 470 nm; 44.4, 44.7 at 546 nm; 45.6, 45.8 at 589 nm; and 47.2, 47.2 at 650 nm. Twelve electron-microprobe analyses of panskyite gave an average composition: Pd 55.61, Ag 12.36, Pb 23.50, Fe 0.21, Ni 0.24 and S 7.17 total 99.09 wt.%, corresponding to the formula (Pd9.05 Fe0.07 Ni0.07 )Σ9.19 Ag1.98 Pb1.96 S3.87 based on 17 atoms; the average of nine analyses on the synthetic analogue is: Pd 57.02, Ag 14.17, Pb 21.81 and S 7.44, total 100.44 wt.%, corresponding to Pd9.07 Ag2.22 Pb1.78 S3.93 . The density, calculated on the basis of the empirical formula, is 9.81 g/cm 3 . The mineral is tetragonal, space group I 4 /mmm, with a = 7.973(3), c = 9.139(3) Å, V = 581.0(4) Å 3 and Z = 2. The crystal structure was solved from the single-crystal and powder X-ray diffraction data of synthetic Pd9 Ag2 Pb2 S4 . Panskyite is isostructural with thalhammerite (Pd9 Ag2 Bi2 S4 ). The mineral name is for the locality, the Pansky massif of the Fedorova–Pana layered intrusion in the Kola Peninsula, Russia.