Which term describes a regular, repeating arrangement of atoms in a mineral?

Which term describes a regular, repeating arrangement of atoms in a mineral?

• A. Crystalline
• B. Crystal systems
• C. Crust
• D. Crystal structure (lattice)

Answer: (D)

Regular, repeating arrangement of atoms in a mineral is described by its crystal structure, also called the crystal lattice. This long-range order means atoms occupy a consistent three-dimensional pattern, which gives minerals their symmetry and characteristic shapes. The term crystal structure (lattice) captures both how the atoms are arranged and the repeating framework they form. Describing a material as crystalline refers to having such order, but it isn’t the arrangement itself. Crystal systems classify the overall lattice geometry and symmetry, not the specific repeating pattern, and the crust is unrelated to atomic arrangement. So the repeating arrangement is best described by crystal structure (lattice).

Regular, repeating arrangement of atoms in a mineral is described by its crystal structure, also called the crystal lattice. This long-range order means atoms occupy a consistent three-dimensional pattern, which gives minerals their symmetry and characteristic shapes. The term crystal structure (lattice) captures both how the atoms are arranged and the repeating framework they form. Describing a material as crystalline refers to having such order, but it isn’t the arrangement itself. Crystal systems classify the overall lattice geometry and symmetry, not the specific repeating pattern, and the crust is unrelated to atomic arrangement. So the repeating arrangement is best described by crystal structure (lattice).