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Aquamarine

Aquamarine is gemstone-quality blue beryl. Aquamarines can be found in the United States in Colorado at the summit of Mt. Antero in the Collegiate Range in central Colorado.

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Quadratic formula

... be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no square roots and some have two; only zero ...