Lustre
- Lustre shows if a mineral is shiny or not.
- Some minerals such as gold and silver, appear shiny - another clue to their identity.
- Other minerals appear dull.
- The shininess, or lustre, of a mineral depends on how light is reflected off of it.
- If a mineral shines like a polished metal surface, it has a metallic lustre.
- If a mineral doesn't shine like a metal, it has a non-metallic lustre.