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