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Crossword clue: a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium

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a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium

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A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.