Answer:
C industrial processes and gems
Step-by-step explanation:
Non - metallic minerals can be used for industrial processes and as gems. Some non - metallic minerals have great value, good cut and attract a good market price. Example is ruby and tourmaline.
- Most non -metallic minerals are used for industrial process especially as raw materials.
- These materials are poor conductors and cannot be used as one.
- They cannon be used for wiring because they lack metallic bonds within their lattices.
- So, the best used is for industrial processes, for the valuable ones, they are of good gem grade.