hjelmite

noun
hjelm·​ite
variants: or less commonly hielmite \ ˈ(h)yelˌmīt , hēˈel-​ \
plural -s

Definition of hjelmite

: 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

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History and Etymology for hjelmite

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

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