lonsdaleite
noun/ˈlɒnzdəlaɪt/ · /ˈlɒnzˌdeɪlaɪt/
Etymology From Lonsdale + -ite, in honour of Irish crystallographer Kathleen Lonsdale.
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Chemistry, Geography, Geology, Mineralogy, Natural sciences, Physical sciences Usually A hexagonal-dihexagonal dipyramidal mineral containing carbon. Also called hexagonal diamond.