A type of mineral or crystalline compound found in certain geological formations.
From a place name or scientist's name (likely *Hedrum*) plus the mineralogical suffix *-ite*. The suffix -ite is standard for naming newly discovered minerals.
Geologists name new minerals all the time, often after places or famous scientists, which is why you get such wonderfully specific names like 'hedrumite' that tell the story of mineral discovery and scientific history.
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