Platinum is formed as a product of the violent explosion of a supernova star, and all the platinum found on earth was formed in this way and was incorporated into the earth as the earth was formed from gas and dust during the formation of the solar system.

However, what I think you mean is how are platinum DEPOSITS formed in the earth's crust.
These are mostly formed from the reaction of magma with crustal rocks, as the magma is emplaced in the crust.

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