to rsvp to myself.....

The platinum group metals are platinum, palladium, rhodium, osmium, ruthenium & iridium.

Whilst this may sound like pure periodic table chat, these are all important elements whose strong relationship with each other is of some importance to the geologists and geochemists that search for them. Rarely does one find deposits of just one of these elements, they are inevitably bundled together in the ground. As a consequence, assay results of samples taken to find these metals are often given as the total concentration of PGMs.

Just in case you were wondering.

stales