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Mineralogical ClassificationPalladosilicide IMA 2014-080 published

26th May 2015 10:55 UTCChris Stanley Expert

E-prints from me on request. C.Stanley@nhm.ac.uk or orebodies@hotmail.com


Palladosilicide, Pd2Si, is a new mineral (IMA 2014-080) discovered in chromite-rich samples from the

Kapalagulu intrusion, western Tanzania (30º03’51’’E 5º53’16’’S and 30º05’37’’E 5º54’26’’S) and from the

UG-2 chromitite, Bushveld complex, South Africa. A total of 13 grains of palladosilicide, ranging in size

from 0.7 to 39.1 mm (equivalent circle diameters), were found. Synthetic Pd2Si is hexagonal, space group

P6¯2m, with a = 6.496(5), c = 3.433(4) A ˚ , V = 125.5(1) A ˚ 3, c:a = 0.529 with Z = 3. The strongest lines

calculated from the powder pattern (Anderko and Schubert, 1953) are [d in A ˚ (I) (hkl)] 2.3658 100 (111);

2.1263 37 (120); 2.1808 34 (021); 3.240 20 (110); 1.8752 19 (030); 1.7265 12 (002); 1.3403 11 (122);

1.2089 10 (231). The calculated density for three analyses varies from 9.562 to 9.753 g cm3.

Palladosilicide is considered to be equivalent to synthetic Pd2Si based on results from electron

backscattered diffraction analyses. Reflectance data in air for the four Commission on Ore Mineralogy

wavelengths are [l nm, R1 (%) R2 (%)] 470 49.6 52.7; 546 51.2 53.8; 589 51.6 53.7; 650 51.7 53.3 and the

mineral is bright creamy white against chromite, weakly bireflectant and displays no discernible

pleochroism or twinning. It is weakly anisotropic, has weak extinction and rotation tints in shades of blue

and olive green. Electron probe microanalyses of palladosilicide yield a simplified formula of Pd2Si.

20th Jun 2015 08:50 UTCKnut Edvard Larsen 🌟 Manager

Cabri, L.J., McDonald, A.M., Stanley, C.J., Rudashevsky, N.S., Poirier, G., Wilhelmij, H.R., Zhe, W., Rudashevsky, V.N. (2015) Palladosilicide, Pd2Si, a new mineral from the Kapalagulu Intrusion, Western Tanzania and the Bushveld Complex, South Africa , Mineralogical Magazine, 79 , 295–307


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