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