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Pyrite

/ˈpaɪraɪt/noun

A brassy yellow iron sulphide mineral that forms hard cubic crystals.

The Greek roots

πῦρ
pŷr
fire
+
πυρίτης
pyrítēs
of fire, firestone

Literally: fire stone

The story of the word

πυρίτης λίθος meant the stone of fire, and that was a job description: strike a lump against steel and it throws sparks, which is how it was carried in tinderboxes for centuries. Fool's gold is a much later nickname, earned in earnest during the 1849 rush. The same πῦρ burns in pyre, pyromania and antipyretic.

How it travelled
Ancient Greek → Latin → English
First recorded
16th century

Same family

pyrepyromaniapyrotechnicsantipyreticempyrean

In a sentence

A cube of pyrite sat on the windowsill, sharp-edged enough to look machined.

The assay came back worthless, which surprised nobody who had seen the pyrite in the tailings.

Built on the same root

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