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