Know all about Rhomb Porphyry and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Rhomb Porphyry and Obsidian belong to Igneous Rocks.Texture of Rhomb Porphyry is Aphanitic to Porphyritic whereas that of Obsidian is Glassy. Rhomb Porphyry appears Rough and Obsidian appears Shiny. The luster of Rhomb Porphyry is subvitreous to dull while that of Obsidian is vitreous. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, 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 Obsidian are creating artwork, mirror, used in aquariums.