Know all about Gneiss and Suevite properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss and Suevite belong to Metamorphic Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Suevite is Earthy. Gneiss appears Foliated and Suevite appears Banded. The luster of Gneiss is dull while that of Suevite is earthy. Gneiss is available in black, brown, pink, red, white colors whereas Suevite is available in black, brown, colourless, green, grey, pink colors. The commercial uses of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Suevite are as a feed additive for livestock, gemstone, metallurgical flux, source of magnesia (mgo).