thortveitite
noun
thort·veit·ite
(ˈ)tȯ(r)t¦vīˌtīt,
(ˈ)thȯ-
plural -s
: a mineral (Sc,Y)2Si2O7 consisting of scandium yttrium silicate and occurring in slender grayish-green orthorhombic crystals (hardness 6–7, specific gravity 3.6)
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Merriam-Webster unabridged
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