A mineral or type of rock, though the precise mineralogical definition is obscure or outdated in modern geology.
From Greek gymnos (naked) + -ite (mineral suffix). Like many mineral names, it likely referred to an uncoated or bare appearance of the crystalline structure.
Mineralogy is full of 'naked' and 'bare' named minerals—geologists literally named rocks based on whether they looked dressed up or stripped down, which is charming scientific whimsy!
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