A mineral composed of lead, bismuth, and sulfur that forms in certain geological environments.
From geo- (Greek gē, 'earth') + chrono- (Greek chronos, 'time') + -ite (mineral suffix). The name suggests a mineral marked by geological time periods, though the etymology is somewhat obscure in mineralogical literature.
Geocronite is so rare that most mineralogists will never see it in person—it's a bismuth-lead sulfide found only in specific mining districts, making it a geological time capsule of conditions that don't happen anymore.
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