Based on your question, the three correct statements about minerals are:
- Minerals are made of one element or one compound of elements.
- Minerals are naturally occurring substances.
- Minerals are the components that make up rocks.
The other statements are incorrect because:
- Rocks are not components that make up minerals; rather, minerals make up rocks.
- Identifying minerals typically requires observing multiple properties, not just color and hardness.
- Observing one property alone is not usually the best way to identify a mineral; a combination of properties is usually necessary for accurate identification.