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Spodumene

Spodumene is a pyroxene mineral consisting of lithium aluminum silicate and is a source of lithium. It is a white to yellowish, purplish, or emerald-green color and occurs in prismatic crystals[?], often of great size.

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Quadratic formula

... \sqrt {b^2-4ac}</math> in the formula should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, ...