Answer: Luster
Explanation:
Luster is the physical property of minerals showing how a mineral reflects light. There are two types of Luster which are
Metallic Luster---Metallic luster are for minerals that look reflective like that of a polished metal. Examples include gold and copper.
Nonmetallic minerals are minerals that do not look reflective and polished like like metal, Instead their appearance may look waxy, Vitreous, Pearly, Silky o, Resinous , greasy or Adamantine etc. Examples include
Adamantine-- Diamond, Vitreous--quartz,Greasy--opal etc
