A rare mineral consisting of copper and antimony oxides, named after a geographic location.
Named after Caswell (likely a place name in England or where it was discovered), with the mineralogical suffix '-ite' added to denote it as a mineral species.
Mineral names are often tiny testaments to place discovery—geologists naming caswellite were essentially leaving a time capsule marking where and when this rare combination of elements was first identified.
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