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The monoclinic crystal system is defined by three axes of unequal lengths, with two of the axes intersecting at right angles (α = γ = 90°) while the third axis intersects the others at an angle other than 90° (angle β). Minerals commonly found in the monoclinic crystal system include sulfur (which also occurs in a rhombic form), gypsum, augite, muscovite, biotite and hornblende.
