Five percent of the earths crust is made up of Iron. Native Iron is rare in the crust, and is invariably alloyed with Nickel. Low nickel iron up to 7.5% nickel is called Kamacite, and high nickel iron up to 50% nickel is called taenite. Both of these froms of nickel are mainly crystalline in the cubic system. A third form of Iron-nickel that's mainly found in meteorites, and crystalizing in the tetragonal system, is called Tetrataenite. All three forms are generally found either as disseminated grains or as rounded masses. Kamacite is the major component of most iron meteorites. It is found in most chondriiic meteorites, and occurs as microscopic grains in some lunar rocks. Taenite and tetrataenite are mainly found in meteorites, and often intergrown with Kamacite. Iron is also plentiful in the sun, and other starts in our galaxy.
The first documented discovery of platinum was discovered by the Spaniards in the 1500's, in the alluvial gold mines of Rio Pinto, Columbia. They use to call it Platina Del Pinto, from platina, which means Little Silver, thinking that it was an impure ore of silver. It was not recongnized as a distinct metal until 1735. Its rather an opaque, silvery grey, and markedly dense. Platinum usually occurs as disseminated grains in Iron and magnesium rich igneous rocks, and sometimes in quartz veins that are associated with hematite, chlorite, and pyrolusite. When rocks weather, the heavy platinum accumulates as grains, and nuggets in the resulting placer deposits. Crystals are rare, but when found the are rather cubic. Most platinum for commercial use is recovered from primary deposits. Native platinum typically contains iron, and metals such as Palladium, Iridium, and Rhodium.