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As one of the properties in minerals, there are different types of luster as there are different mineral categories. Luster is divided into two categories namely nonmetallic and metallic. Metallic minerals tend to have a shiny and opaque appearance. There are various sub-categories of luster in nonmetallic minerals.
2) STREAK. This is the colour of the line drawn when a mineral is rubbed across a piece of unglazed tile. Often the line is the same or similar colour of the specimen.This test is useful because in a few cases, similar looking minerals have different streaks - so this test is a definitive identifier. Luster is what the surface looks like when the light reflects off of the mineral. Some words to describe luster are: 1  DULL / EARTHY - very dull, mainly minerals that are porous eg kaolinite, orthoclase.  WAXY - like the surface of a candle, like wax paper eg opal, chalcedony.