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In crystallography, the isometric or cubic crystal system is characterized by three mutually perpendicular axes of equal length. These axes are usually labeled as a₁, a₂, and a₃ and intersect at angles of 90°, forming a cube-like geometry. The equal length of the axes gives rise to high symmetry, making the isometric system the most symmetrical of all seven crystal systems. The axes serve as a reference for describing crystal faces, directions, and angles between faces. Crystals belonging to this system include common minerals such as pyrite, galena, magnetite, and fluorite. The symmetry elements of the isometric system define how the crystal can be transformed and still appear unchanged. In the normal or holohedral class of the isometric system, the key symmetry elements include four 3-fold axes, three _______ __________ ___ _______ ____ ________.
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