Question

what determines a minerals unique characteristics?
color and temperature resistance
age and location where its found
size and weight of the sample
chemical composition and crystal structure

Explanation:

The chemical composition determines the elements present in a mineral, and the crystal structure affects its physical - properties like hardness, cleavage, and luster. These two factors together give a mineral its unique characteristics. Color can be variable due to impurities, age and location don't define the fundamental properties, and size and weight are physical measurements that don't determine the mineral's nature.

Answer:

D. Chemical composition and crystal structure