Know all about Gneiss and Foidolite properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Foidolite belongs to Igneous Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Foidolite is Earthy. Gneiss appears Foliated and Foidolite appears Dull. The luster of Gneiss is dull while that of Foidolite is subvitreous to dull. Gneiss is available in black, brown, pink, red, white colors whereas Foidolite is available in black, brown, colourless, green, grey, pink, white colors. The commercial uses of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Foidolite are cemetery markers, commemorative tablets, creating artwork.