- Different materials usually have different properties
- A mineral is a kind of material
- Therefore, different minerals usually have different properties

- Different minerals usually have different properties
- Samples of a single type of mineral usually have the same properties
- Therefore, different minerals usually have different properties and samples of a single type of mineral usually have the same properties

- Different minerals usually have different properties and samples of a single type of mineral usually have the same properties
- The properties of something can be used to identify / used to describe that something
- So, the properties of a mineral can be used to identify those minerals

Hence, the properties of a mineral can be used to identify those minerals
Question: Minerals can be identified using hardness, streak, and cleavage because
Context: - Samples of a single type of mineral usually have the same properties 
- Different materials usually have different properties 
- The properties of something can be used to identify / used to describe that something 
- A mineral is a kind of material