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thortveitite

A monoclinic mineral, (Sc,Y)2Si2O7; may contain up to 42% yttrium replacing scandium; weakly radioactive; grayish green where fresh, altering to white to reddish gray; in pegmatites associated with monazite, euxenite, beryl, struvite, and possibly fergusonite; the only known mineral rich in scandium.

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  • ed.young
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