A rare mineral containing beryllium that forms in specific geological conditions.
From beryllium, the metallic element named after beryl (a gemstone), combined with the mineral suffix -onite, meaning a type of stone or mineral.
Beryllium is so toxic when inhaled that it was once used in fluorescent lamp coatings before scientists realized workers were developing a severe lung disease called berylliosis—this mineral's name basically commemorates a workplace tragedy that led to strict safety regulations.
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