Know all about Rhomb Porphyry and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Rhomb Porphyry belongs to Igneous Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Rhomb Porphyry is Aphanitic to Porphyritic whereas that of Greywacke is Clastic. Rhomb Porphyry appears Rough and Greywacke appears Dull. The luster of Rhomb Porphyry is subvitreous to dull while that of Greywacke is dull. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors whereas Greywacke is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Rhomb Porphyry are an oil and gas reservoir, as a feed additive for livestock, metallurgical flux, soil conditioner, source of magnesia (mgo) and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.