Chalcocite crystals. Chalcocite, copper (i) sulphide, is an important copper ore mineral.

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Photo credit: © PETR JAN JURACKA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, chalcocite, chemical, chemistry, compound, copper, crystal, crystals, geological, geology, macro, mineral, mineralogical, mineralogy, minerals, ore, photograph, sample, specimen, sulfide, sulphide