Answer:
C. composition
Step-by-step explanation:
Most minerals have a critaline structure that allows to identify the composition of this mineral and to which crystalline system it belongs.
There are seven crystalline systems and all are directly related to the composition of the mineral. These systems are characterized by sets of crystals with equal crystallographic axes in size and constant angular relations.
The seven crystalline systems are: Cubic, Tetragonal, Orthorhombic, Hexagonal, Trigonal, Monoclinic and Triclinic.