Answer:
Benny and Alice are describing the property of hardness, which is often used to identify specific mineral families.
Step-by-step explanation:
- The properties like streak, cleavage, luster, specific gravity, crystal habit, fracture, and color that of minerals do not make specific families of minerals based on that particular property.
- On the other hand, the hardness of the minerals is used to identify them with their families depending on how hard the mineral is.
- The metallic minerals are usually harder than rocky minerals.