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Adamant
Adamant in classical mythology is an archaic form of diamond. The English word diamond is ultimately derived from adamas, via Late Latindiamas and Old Frenchdiamant. In ancient Greek (adamas), genitive ἀδάμαντος (adamantos), literally 'unconquerable, untameable'. In those days, the qualities of hard metal (probably steel) were attributed to it, and adamant became an independent concept as a result.
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