Question

There are two main ways that minerals are classified. Which identifies those two main ways?

Answer 1

A mineral is a naturally occurring inorganic crystalline solid that are the building blocks of rocks. Rocks are made up of different minerals. The most appropriate answer is c. crystal structure and economic value. Some minerals are classified as semiprecious or precious because of their economic value.  Minerals such as diamonds and emeralds are precious and are very valuable. 

Answer 2

Minerals are classified based on their physio chemical properties

The chemical properties are related to crystal structure

physical appearance  of mineral defines its cost

so the minerals are classified based on crystal structure and economic value