Know all about Rhomb Porphyry and Gossan 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 Gossan belongs to Metamorphic Rocks.Texture of Rhomb Porphyry is Aphanitic to Porphyritic whereas that of Gossan is Rough, Sandy. Rhomb Porphyry appears Rough and Gossan appears Dull and Banded. The luster of Rhomb Porphyry is subvitreous to dull while that of Gossan is metallic. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors whereas Gossan is available in brown, brown- black, gold, green, rust 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 Gossan are cemetery markers, commemorative tablets, gemstone.