Galvorn
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In the fiction of J. R. R. Tolkien, Galvorn was a jet black metal (probably an alloy) devised by the Dark Elf Eöl after he became greatly skilled in metalwork from the Dwarves of Nogrod and Belegost. The unique metal was as strong as the steel of the Dwarves, extremely malleable, and resistant to injury by metal weapons. Its only known use is in Eöl's armour, which he wore whenever he left his forest residence.
Eöl taught all his secrets to his son Maeglin, who later fled to Gondolin. So it is possible that the Elf-smiths of Gondolin also learnt how to make Galvorn armour. In the story 'Of Tuor and his coming to Gondolin' in Unfinished Tales Tuor sees the Guards of the City wearing armour of a strange black metal. This is likely Galvorn.