Which property of a mineral most directly results form atom arrangement?

The property of a mineral that most directly results from its atomic arrangement is its crystal structure. The specific arrangement of atoms within the mineral determines its symmetry, shape, and overall crystalline form, which can influence other properties such as cleavage, hardness, and optical characteristics. For example, different atomic arrangements lead to distinct crystal systems, such as cubic, tetragonal, or hexagonal. Thus, the internal architecture of a mineral is fundamental to its physical properties.