A mineral or crystalline substance (the precise identity is uncertain in historical texts, possibly related to ferrum or iron-bearing compounds).
From Latin 'ferrum' (iron) combined with the mineralogical suffix '-anite', following the naming convention for minerals and rocks.
Fervanite is a ghost mineral—mentioned in old geology texts but so poorly documented that modern mineralogists can't definitively identify what it actually was, making it a fun example of how scientific knowledge gets refined or abandoned over time.
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