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How did Andreas Libavius prepare metallic antimony in 1615?

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A labeled periodic table entry for antimony shows its symbol Sb, atomic number 51, atomic weight 121.76, electron configuration, and name. It is a solid, weakly acidic other metal with a rhombohedral crystal structure at room temperature. — antimony Properties of antimony.

In 1615, the German physician and chemist Andreas Libavius described the preparation of metallic antimony through the direct reduction of its sulfide with iron.1