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This depends on whether salt, feldspar, or frost was discovered first and by whom; salt is at the beach and in caves; feldspar is near ancient volcanos; frost is anywhere below freezing. These minerals already crýstallize microscopically and are called crýptocrýstalline in raw form; therefore any rock that is not glassy already consists of crýstals. If one talks of those seen by the naked eye, I would say salt was the first discovered in Africa. But who was the first species and must it be within the Homo genus? The first walkers, Homo erectus, had the ability to migrate to other continents and could likely be the first discoverers.

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