A rare mineral composed of copper, antimony, and sulfur that forms in specific geological conditions.
From Greek 'chalkos' (copper), 'stibi' (antimony), and the mineral suffix '-ite,' combining the names of its component elements.
Chalcostibite is so rare that most geologists have never actually seen a real specimen—it's more exciting to mineral collectors than to industrial miners since antimony-copper minerals don't produce copper as efficiently as other ores.
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