A type of igneous rock, specifically a variety of phonolite that is composed mainly of feldspathoid minerals.
Named after Foya, a location in Portugal where this rock type is found, with the mineral suffix '-ite.' The location-based naming convention is standard in mineralogy and petrology.
Geologists name rocks after where they're found or who discovers them, which is why the periodic table and mineral world is full of place names—'foyaite' tells you exactly where geologists first identified this specific rock type and want credit for the discovery.
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