Platinum (Var: Polyxene) : (Pt,Fe,Cu,Ni,Pd,Rh), Isoferroplatinum : Pt3Fe, Gold : Au, Magnesiochromite : MgCr2O4

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Summary of all keyboard shortcuts

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Copyright © Pavel M. Kartashov collection & photo
minID: 29V-VUD

Platinum (Var: Polyxene) : (Pt,Fe,Cu,Ni,Pd,Rh), Isoferroplatinum : Pt3Fe, Gold : Au, Magnesiochromite : MgCr2O4

Copyright © Pavel M. Kartashov collection & photo  - This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 12.5 mm

Portion of heavy concentrate mainly composed by wrought and waterworn, flattened grains of far transportation of Ferroplatinum of different composition, black crystals of Magnesiochromite and yellow grains of native Gold less far transported by water stream than platinum.
Ferroplatinum is represented here by two inrecognizable by naked eye minerals - Polyxene and Isoferroplatinum. Polyxene has composition Pt 92.05/92.75, Pd 0.75/0.50, Fe 5.83/6.02, Cu 1.29/0.50 mas.%, what may to be expressed by formulae (Pt0.78Fe0.17Cu0.03Pd0.01) / (Pt0.80Fe0.18Cu0.01Pd0.01). This is low ferroan Polyxene, what is unusual. May be it is of secondary origin and was formed during oxidation of iron from Isoferroplatinum.
Isoferroplatinum has composition Pt 87.53/88.84, Ir 1.99/0.64, Rh 0.48/0.00, Pd 0.35/0.20, Fe 9.03/9.75, Cu 0.63/0.57 mas.%, what may to be expressed by formulae (Pt2.81Ir0.07Cu0.06Rh0.03Pd0.02)2.99Fe1.01 / (Pt2.84Cu0.04Ir0.04)2.92Fe1.08.
Due to different iron contents in these two minerals, they able to be separated by magnites.
The brightmost rare tin-white grains are native Iridium with composition (Ir0.86Os0.10Ru0.03Pt0.01).
Invisible at the photo minerals of the concentrate are represented by black Laurite and Erlichmanite crystals, Pyrite, Zircon, Magnetite crusts over Magnesiochromite crystals.
Pavel M. Kartashov analytical data, collection and photo.

This photo has been shown 112 times
Photo added:13th Apr 2019
Dimensions:1999x1499px (3.00 megapixels)
Date/Time of Photo:30th Nov -0001 00:00:00
Camera:NIKON E4500
Exposure time:1/175s
Focal Length:13mm
Focal Length (35mm film equivalent):62mm
ISO speed:100

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