Know all about Slate and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Slate belongs to Metamorphic Rocks while Porphyry belongs to Igneous Rocks.Texture of Slate is Foliated whereas that of Porphyry is Porphyritic. Slate appears Dull and Porphyry appears Dull. The luster of Slate and Porphyry is dull. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses 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 and that of Porphyry are creating artwork, gemstone, jewelry.