Know all about Obsidian and Diorite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian and Diorite belong to Igneous Rocks.Texture of Obsidian is Glassy whereas that of Diorite is Phaneritic. Obsidian appears Shiny and Diorite appears Shiny. The luster of Obsidian is vitreous while that of Diorite is shiny. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Diorite is available in black, brown, light to dark grey, white colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Diorite are creating artwork, curling.