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
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Merriam-Webster unabridged
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