Lustre Lustre refers to the way in which the mineral reflects light. It may be referred to as metallic (like a metal) or non-metallic. Metallic & non-metallic are the most frequently lustres used but non-metallic lustres are sometimes subdivided.

Vitreous	The lustre of glass
Adamantine	The lustre of a diamond
Waxy	With a wax like appearance
Earthy	Dull and Earth Like,
Metallic	Shiny Like Metal