Plural of adamant; mythical or extremely hard stones, or in the Bible, the hardest stones known, sometimes identified with diamonds or sapphires.
From Greek 'adamas' (unbreakable), possibly from 'a-' (not) + 'damao' (to tame), literally meaning 'untameable'; used in ancient texts to describe supremely hard materials.
In medieval literature and the Bible, 'adamants' were more legendary than real—they represented the idea of ultimate hardness before scientists had tools to actually measure and compare mineral hardness scientifically.
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