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From Renge + -ite. Named after Mt. Renge (in Niigata, Japan) where the jadeitite deposits are found.
Etymology from Wiktionary, CC BY-SA 4.0.
rengeite
Today it means: A monoclinic-prismatic dark greenish brown mineral containing calcium, lanthanum, cerium, praseodymium, neodymium, samarium, oxygen, silicon, strontium, titanium, and zirconium. Full definition →