- A mineral can be scratched by a fingernail
- If a mineral can be scratched by a fingernail then that mineral is soft
- Therefore, a mineral is soft

- A mineral is soft
- A mineral has a nonmetallic luster
- If a mineral is black in color
- Therefore, that mineral is black, has a nonmetallic luster, and is soft

- Mica has a nonmetallic luster
- Mica is a kind of mineral
- Mica is black in color
- Mica is soft
- Therefore, mica is a mineral that is black, has a nonmetallic luster, and is soft

- That mineral is black, has a nonmetallic luster, and is soft
- Mica is a mineral that is black, has a nonmetallic luster, and is soft
- So, that mineral is mica

Therefore, that mineral is mica
Question
A student is trying to identify a mineral that has a nonmetallic luster and is black. It can also be scratched with a fingernail. According to the mineral reference sheet, the unidentified mineral is most likely

Context
- Mica has a nonmetallic luster 
- A mineral can be scratched by a fingernail 
- Mica is a kind of mineral 
- If a mineral can be scratched by a fingernail then that mineral is soft 
- Mica is black in color 
- A mineral has a nonmetallic luster 
- If a mineral is black in color 
- Mica is soft