695 words
Crystalline minerals exhibit six distinct geometric systems—tesseral, tetragonal, rhombic, monoclinic, triclinic, and hexagonal—each defined by characteristic axes and bounded surfaces that generate specific polyhedra through mathematical principles of symmetry and division. Minerals themselves are classified as inorganic, solid natural bodies formed through geological processes, encompassing elements, ores, stones, haloids, and other homogeneous substances distinguished by their crystalline structure and composition.