Mineral Lusters - Geology for Today - Dr. Tambra L. Eifert
A mineral's luster is the general appearance of its surface in reflected light. There are two broad types of luster: metallic and nonmetallic. Metallic luster is that of an untarnished metal surface, such as gold, steel, copper, galena, pyrite, and hematite. Minerals with metallic luster can also be described as having a "shiny", "dull ...