SEM image. Light-grey in BSE prismatic crystal of sobolevskite (with composition changing from Pd1.04Bi.96 to Pd1.04(Bi.84Pb.12).96) with abundant inclusions of PGM grains into "massive" grey tetraferroplatinum (with composition Pt.87(Fe.83Ni.18Cu.12)1.13) matrix.
Three radically black drops are represented by DIENERITE with composition Ni3.10As.90.
Grey drops are sperrylite PtAs2.
Large light prismatic grain on the bottom of sobolevskite crystal is urvantsevite Pd1.01(Bi1.47Pb.52)1.99.
Dark grey triangular grain under urvantsevite one is stannopalladinite with more bright minute inclusions of unnamed Pd12NiBi3Sn3. Dark-grey prismatic crystals into tetraferroplatinum also are stannopalladinite.
Very similar to former dark-grey prismes included into sobolevskite are unnamed Pd4SbSn.
Fnd at last two Au-Ag-Cu alloys grains located on SW and NE corners of sobolevskite crystal. The first, bright one is gold of composition Au.70Ag.30. The second, grey one (close to platinum by colour, it is marked by the third, upper dienerite drop) is "copper" of composition Cu.56Au.40Pd.04.
Pavel M. Kartashov collection and photo.
Three radically black drops are represented by DIENERITE with composition Ni3.10As.90.
Grey drops are sperrylite PtAs2.
Large light prismatic grain on the bottom of sobolevskite crystal is urvantsevite Pd1.01(Bi1.47Pb.52)1.99.
Dark grey triangular grain under urvantsevite one is stannopalladinite with more bright minute inclusions of unnamed Pd12NiBi3Sn3. Dark-grey prismatic crystals into tetraferroplatinum also are stannopalladinite.
Very similar to former dark-grey prismes included into sobolevskite are unnamed Pd4SbSn.
Fnd at last two Au-Ag-Cu alloys grains located on SW and NE corners of sobolevskite crystal. The first, bright one is gold of composition Au.70Ag.30. The second, grey one (close to platinum by colour, it is marked by the third, upper dienerite drop) is "copper" of composition Cu.56Au.40Pd.04.
Pavel M. Kartashov collection and photo.
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