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Crystal Systems

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Triclinic

Axial Lengths: a ≠ b ≠ c; Angles: α ≠ β ≠ γ; Example Minerals: Turquoise, Kyanite

Monoclinic

Axial Lengths: a ≠ b ≠ c; Angles: α = γ = 90°, β ≠ 90°; Example Minerals: Gypsum, Orthoclase

Trigonal

Axial Lengths and Angles: a = b = c; α = β = γ < 120° ≠ 90°; Example Minerals: Calcite, Corundum

Cubic

Axial Lengths: a = b = c; Angles: α = β = γ = 90°; Example Minerals: Halite, Pyrite

Tetragonal

Axial Lengths: a = b ≠ c; Angles: α = β = γ = 90°; Example Minerals: Zircon, Chalcopyrite

Hexagonal

Axial Lengths: a = b ≠ c; Angles: α = β = 90°, γ = 120°; Example Minerals: Beryl, Quartz

Orthorhombic

Axial Lengths: a ≠ b ≠ c; Angles: α = β = γ = 90°; Example Minerals: Topaz, Barite

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