Know all about Obsidian and Troctolite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian and Troctolite belong to Igneous Rocks.Texture of Obsidian is Glassy whereas that of Troctolite is Phaneritic. Obsidian appears Shiny and Troctolite appears Veined and Shiny. The luster of Obsidian is vitreous while that of Troctolite is not available. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Troctolite is available in dark grey to black colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Troctolite are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.