Platinum (Pt) is far more valuable that gold, but it doesn't have a distinctive, prestigious color. Like most metals, platinum has a silvery color. Platinum, when purified, is heavier than gold, but specimen platinum has about the same specific gravity as gold nuggets (about 19).
Platinum is alway found significantly alloyed with other elements, usually other PGEs (platinum-group elements: platinum (Pt), palladium (Pd), osmium (Os), iridium (Ir), rhenium (Re), rhodium (Rh), ruthenium (Ru)). Platinum is typically found in Precambrian ultramafic igneous rocks, but there are also some Pt-bearing placer deposits in Canada, Colombia, and Russia.
Platinum nuggets (~1 to 2 mm in size) from a placer deposit in Granite Creek, a tributary of the Tulameen River near Granite City, a ghost town in southern British Columbia, southwestern Canada.
This was a significant platinum occurrence. It's been reported that >20,000 ounces worth of platinum nuggets were recovered from this area from the mid-1880s to the mid-1930s.
Granite Creek platinum nuggets are derived from weathering of PGE-bearing chromitic dunites in the Tulameen Ultramafic Complex of Early Jurassic age.
Available assay information indicates that Granite Creek nuggets are 68 to 78% platinum (Pt), 4 to 14% osmiridium (Ir,Os), 8 to 10% iron (Fe), 3 to 4% copper (Cu), 3% rhodium (Rh), 1% iridium (Ir), and 0.2% palladium (Pd).
Platinum mass & well-formed crystals from Russia.