A rare mineral composed of calcium and sulfur that forms crystals in hydrothermal environments.
From 'ark' (from Hebrew Arca, meaning chest) + the mineralogical suffix '-ite' (meaning stone or mineral). Named in the 19th century by mineralogists studying crystal formations.
Arkite is so rare that most geology students never see a real sample—it's like the collector's holy grail of minerals, found in only a handful of locations worldwide.
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