Know all about Troctolite and Gneiss properties here. All properties of rocks are important as they define the type of rock and its application. Troctolite belongs to Igneous Rocks while Gneiss belongs to Metamorphic Rocks.Texture of Troctolite is Phaneritic whereas that of Gneiss is Banded, Foliated, Platy. Troctolite appears Veined and Shiny and Gneiss appears Foliated. The luster of Troctolite is not available while that of Gneiss is dull. Troctolite is available in dark grey to black colors whereas Gneiss is available in black, brown, pink, red, white colors. The commercial uses of Troctolite are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones and that of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums.