Relating to or containing cyanite (also called kyanite), a blue aluminum silicate mineral found in metamorphic rocks.
From 'cyanite' (from Greek 'kyanos' meaning blue, because of the mineral's typical color) + '-ic' (adjective suffix). A mineralogical term.
Cyanite is valuable because it transforms under heat and pressure—it's one of the few minerals geologists use as a thermometer to determine exactly how hot ancient rocks got when they formed deep underground.
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