A word used in ancient times to describe the hardest substances such as diamond and steel, but also applied to crystals with imagined magical properties.

The helmet of Eärendil was of adamant, as was Nenya, the ring worn by Galadriel.

Editor's Note: In modern times we say someone is 'adamant' when they insist on a set course or take an immovable position in an argument.
Encyclopedia entry originally written by queen_of_mirkwood