A term used in geology or mineralogy, possibly referring to a type of rock formation or mineral deposit, though its exact definition is obscure.
This appears to be either a highly specialized geological term or possibly a place name used in scientific nomenclature; its etymology is unclear from standard references.
Obscure geological terms like this remind us that science has its own rich vocabulary—often geologists name rocks after the places where they're found, so a rock name might tell you where it was discovered.
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