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Celestite

Celestite (Sr S O₄) is a mineral consisting of strontium sulfate. It is named for its occasional delicate blue color. It occurs crystallized, also in compact massive and fibrous forms.

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Quadratic formula

... common denominator is 4a2. We get <math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math> Taking square roots of both ...