rengeite
noun/ˈɹɛnɡeɪaɪt/
Etymology From Renge + -ite. Named after Mt. Renge (in Niigata, Japan) where the jadeitite deposits are found.
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Chemistry, Geography, Geology, Mineralogy, Natural sciences, Physical sciences A monoclinic-prismatic dark greenish brown mineral containing calcium, lanthanum, cerium, praseodymium, neodymium, samarium, oxygen, silicon, strontium, titanium, and zirconium.