Know all about Obsidian and Nephelinite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian and Nephelinite belong to Igneous Rocks.Texture of Obsidian is Glassy whereas that of Nephelinite is Aphanitic. Obsidian appears Shiny and Nephelinite appears Skeletal. The luster of Obsidian is vitreous while that of Nephelinite is vitreous to metallic. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Nephelinite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo).