Know all about Obsidian and Conglomerate properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian belongs to Igneous Rocks while Conglomerate belongs to Sedimentary Rocks.Texture of Obsidian is Glassy whereas that of Conglomerate is Clastic. Obsidian appears Shiny and Conglomerate appears Shiny and Rounded. The luster of Obsidian is vitreous while that of Conglomerate is dull. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Conglomerate is available in beige, black, brown, buff, light to dark grey, orange, rust, white, yellow colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Conglomerate are cemetery markers, in aquifers, tombstones.