Know all about Ganister and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Ganister belongs to Sedimentary Rocks while Obsidian belongs to Igneous Rocks.Texture of Ganister is Clastic, Granular, Rough whereas that of Obsidian is Glassy. Ganister appears Rough and Obsidian appears Shiny. The luster of Ganister is dull while that of Obsidian is vitreous. Ganister is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Ganister are an oil and gas reservoir, in aquifers, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones and that of Obsidian are creating artwork, mirror, used in aquariums.