A rare mineral, a molybdate of lead and chromium, found in certain ore deposits.
Named after Cortlandt, New York, where this mineral was first discovered and described, following the mineral nomenclature convention of geographic naming.
Cortlandtite is so rare that most geologists will never see a specimen in person—it typically forms only in very specific chemical environments where molybdenum, chromium, and lead minerals all come together in exactly the right conditions.
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