Palladium

palladium

platinum

sobolevskite

lead

Images

Formula: Pd
Native element, platinum group, forms series with gold, with silver and with platinum. When present in compounds, palladium exists mostly in the oxidation state II (ChC).
Specific gravity: 11.9
Hardness: 4½ to 5
Colour: White to pale steel-grey
Solubility: Soluble in nitric acid
Melting point: 1,555oC
Boiling point: 2,960oC
Common impurities: Pt,Ir,Pb,Sn,Bi,Sb,Hg
Abundance: 15 parts per billion by mass, 2 parts per billion by moles in the Earth's crust, 3 parts per billion by mass, 40 part per trillion by moles in the Solar System (ChC)
Environments

Placer deposits

Palladium occurs as a primary mineral in platinum deposits and as an oxidation product of palladium-bearing sulphides (Dana). Associated minerals include platinum-iron alloys, palladium-mercury minerals, gold, gold-silver alloys, lead and sobolevskite (HOM).

Localities

The type locality is the Bom Sucesso Creek, Serro, Minas Gerais, Brazil.

Palladium-bearing minerals include:

Alloys
atheneite
cabriite
paolovite
taimyrite

Antimonides
stibiopalladinite
sudburyite

Arsenides
arsenopalladinite
isomertieite
mertieite

Bismuthides
froodite
polarite
sobolevskite

Selenides
palladseite

Sulphides
vysotskite

Tellurides
keithconnite
kotulskite
merenskyite
michenerite

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