Know all about Slate and Rhomb 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 Rhomb Porphyry belongs to Igneous Rocks.Texture of Slate is Foliated whereas that of Rhomb Porphyry is Aphanitic to Porphyritic. Slate appears Dull and Rhomb Porphyry appears Rough. The luster of Slate is dull while that of Rhomb Porphyry is subvitreous to dull. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, 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 Rhomb Porphyry are an oil and gas reservoir, as a feed additive for livestock, metallurgical flux, soil conditioner, source of magnesia (mgo).