hjelmite

noun

hjelm·​ite

variants or less commonly hielmite

ˈ(h)yelˌmīt,

hēˈel-

plural -s

: a black mineral that contains yttrium, iron, manganese, uranium, calcium, columbium, tantalum, tin, and tungsten oxide, is often metamict, and has uncertain affinities compare samarskite, tapiolite

Word History

Etymology

Swedish hjelmit, from P. J. Hjelm †1813 Swedish chemist + Swedish -it -ite

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