niocalite
/ˌnʌɪəʊˈkalʌɪt/Mineralogy
noun
A basic orthorhombic silicate and fluoride of niobium and calcium, (Ca,Nb)4Si(O,OH,F)9, which occurs as yellow crystals.
Origin
1950s. From nio- + cal- + -ite; apparently coined by E. H. Nickel.
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