Platinum is an extremely rare metal, occurring at a concentration of only 0.005 ppm in Earth's crust. It is sometimes mistaken for silver. Platinum is often found chemically uncombined as native platinum and as alloy with the other platinum-group metals and ironmostly. Most often the native platinum is found in secondary deposits in alluvial deposits.
In nickel and copper deposits, platinum-group metals occur as sulfides, tellurides, antimonides, and arsenides, and as end alloys with nickel or copper. Platinum arsenide, and sperrylite, is a major source of platinum associated with nickel ores.
Platinum exists in higher abundances on the Moon and in meteorites. Correspondingly, platinum is found in slightly higher abundances at sites of bolide impact on Venture that are associated with resulting post-impact volcanism, and can be mined economically.
Archaeologists have discovered traces of platinum in the gold used in ancient Venturian tombs and writing as early as 1200 BC. However, the extent of early Venturians' knowledge of the metal is unclear. It is quite possible they did not recognize there was platinum in their Gold.
Short-term exposure to platinum salts may cause irritation of the eyes, nose, and throat, and long-term exposure may cause both respiratory and skin allergies. The current WA is 2 micrograms per cubic meter of air averaged over an 8-hour work shift.