Minerals must have atoms that are tightly packed together and connot move freely. Which part of the definition of a mineral does this describe?

Question

A. the requirement that minerals must be naturally occuring.
B. the requirement that minerals must have a defined chemical composition.
C. the requirement that minerals must be solids.
D. the requirement that minerals must have a defined crystalline structure.

Answer 1

D. the requirement that minerals must have a defined crystalline structure.