A very rare complex bismuth sulfosalt mineral containing lead and thallium, found only in a few specific locations worldwide.
Compound of bismuto- (bismuth-related) and plagionite (from Greek 'plagios' meaning oblique, referring to crystal angles). These are sulfosalt minerals combining multiple heavy metal elements.
Bismutoplagionite is so rare that complete mineral specimens are museum pieces—it's like the mineral world's equivalent of a celebrity sighting, and geologists get genuinely excited when they find one!
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