Know all about Gneiss and Rhomb Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Rhomb Porphyry belongs to Igneous Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Rhomb Porphyry is Aphanitic to Porphyritic. Gneiss appears Foliated and Rhomb Porphyry appears Rough. The luster of Gneiss is dull while that of Rhomb Porphyry is subvitreous to dull. Gneiss is available in black, brown, pink, red, white colors whereas Rhomb Porphyry 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 Rhomb Porphyry are an oil and gas reservoir, as a feed additive for livestock, metallurgical flux, soil conditioner, source of magnesia (mgo).