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