Lustre
Some minerals appear shiny which is another clue to its identity.
The shininess, or lustre, of a mineral depends on how light is reflected from its surface.If a mineral is shiny , it is said to have a metallic lustre. If a mineral is not shiny , it has a non-metallic lustre.
http://earthsci.org/mineral/rockmin/mineral/mineral_i_d/lustre.jpg
The shininess, or lustre, of a mineral depends on how light is reflected from its surface.If a mineral is shiny , it is said to have a metallic lustre. If a mineral is not shiny , it has a non-metallic lustre.
http://earthsci.org/mineral/rockmin/mineral/mineral_i_d/lustre.jpg
http://harmonscience6.wikispaces.com/file/view/luster.jpg/259935156/luster.jpg