Know all about Gneiss and Diorite properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Diorite belongs to Igneous Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Diorite is Phaneritic. Gneiss appears Foliated and Diorite appears Shiny. The luster of Gneiss is dull while that of Diorite is shiny. Gneiss is available in black, brown, pink, red, white colors whereas Diorite is available in black, brown, light to dark grey, white colors. The commercial uses of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Diorite are creating artwork, curling.