Which property describes a mineral's internal arrangement?

• A. Uniform Atomic Structure
• B. Liquid state
• C. Organic origin
• D. Color and luster

Answer: (A)

The internal arrangement of a mineral is described by its crystal lattice—the orderly, repeating pattern in which atoms bond and stack in three dimensions. This uniform atomic structure gives the mineral a definite chemical composition and a consistent set of physical properties, such as how it breaks along specific planes and the shapes its crystals can take. If a material is in a liquid state, it’s not a solid with a fixed internal structure, so it wouldn’t be a mineral. Organic origin speaks to how a substance formed, not how its atoms are arranged inside. Color and luster describe surface appearance due to light interactions, which can vary even with the same internal structure. So the best description of a mineral’s internal arrangement is the uniform atomic structure.