Know all about Porphyry and Quartzite properties here. All properties of rocks are important as they define the type of rock and its application. Porphyry belongs to Igneous Rocks while Quartzite belongs to Metamorphic Rocks.Texture of Porphyry is Porphyritic whereas that of Quartzite is Foliated, Granular. Porphyry appears Dull and Quartzite appears Lustrous. The luster of Porphyry is dull while that of Quartzite is vitreous. Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors whereas Quartzite is available in black, blue, brown, green, light grey, purple, white, yellow colors. The commercial uses of Porphyry are creating artwork, gemstone, jewelry and that of Quartzite are an oil and gas reservoir, as armour rock for sea walls, cemetery markers, commemorative tablets, in aquifers, laboratory bench tops, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones, used in aquariums.