Know all about Obsidian and Quartzite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian belongs to Igneous Rocks while Quartzite belongs to Metamorphic Rocks.Texture of Obsidian is Glassy whereas that of Quartzite is Foliated, Granular. Obsidian appears Shiny and Quartzite appears Lustrous. The luster of Obsidian and Quartzite is vitreous. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Quartzite is available in black, blue, brown, green, light grey, purple, white, yellow colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Quartzite are an oil and gas reservoir, as armour rock for sea walls, cemetery markers, commemorative tablets, in aquifers, laboratory bench tops, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones, used in aquariums.