Know all about Gneiss and Chert properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Chert belongs to Sedimentary Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Chert is Banded, Rough. Gneiss appears Foliated and Chert appears Glassy or Pearly. The luster of Gneiss is dull while that of Chert is waxy and dull. Gneiss is available in black, brown, pink, red, white colors whereas Chert is available in black, brown, green, grey, red, white colors. The commercial uses of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms.