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