Know all about Rhomb Porphyry and Siltstone 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 Siltstone belongs to Sedimentary Rocks.Texture of Rhomb Porphyry is Aphanitic to Porphyritic whereas that of Siltstone is Clastic. Rhomb Porphyry appears Rough and Siltstone appears Rough. The luster of Rhomb Porphyry is subvitreous to dull while that of Siltstone is dull. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors whereas Siltstone is available in brown, red, reddish brown 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 Siltstone are raw material for the manufacture of mortar, soil conditioner.