Know all about Porphyry and Slate properties here. All properties of rocks are important as they define the type of rock and its application. Porphyry belongs to Igneous Rocks while Slate belongs to Metamorphic Rocks.Texture of Porphyry is Porphyritic whereas that of Slate is Foliated. Porphyry appears Dull and Slate appears Dull. The luster of Porphyry and Slate is dull. Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors whereas Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors. The commercial uses of Porphyry are creating artwork, gemstone, jewelry and that of Slate are blackboards, commemorative tablets, laboratory bench tops, standard material for the bed of billiard table, standard material for the beds of pool and snooker table, tombstones, used in aquariums, writing slates.