Do you speak a little Greek when you say 'pyrites'?

'Pyrites' is a word borrowed from Greek 'pyrites'. The word entered the English language some time around 1543.

pyrites [noun] [1543]

Any of various metallic-looking sulfides of which is the commonest

See 'pyrites' on the Loan Words Map

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Etymology: Latin, flint, from Greek 'pyritēs' of or in fire, from 'pyr' fire

See more loan words from 1500s.