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Which one of the following is least symmetrical?

Triclinic crystals are the least symmetrical.

Triclinic crystals have no axes of symmetry. They may have a center of symmetry. The three reference axes are unequal and are inclined to one another. Common minerals crystallizing in this system are kyanite and plagioclases.

In the triclinic crystal system, we observe all the sides and angles to unequal to each other (a ≠ b ≠ c and α ≠ β ≠ γ ≠ 90o), thus giving the least symmetry (1-fold symmetry) among all 7 Bravais Lattices.