Know all about Obsidian and Ijolite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian and Ijolite belong to Igneous Rocks.Texture of Obsidian is Glassy whereas that of Ijolite is Earthy, Granular. Obsidian appears Shiny and Ijolite appears Banded and Foilated. The luster of Obsidian is vitreous while that of Ijolite is greasy to dull. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Ijolite is available in brown, buff, cream, green, grey, pink, white colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Ijolite are cemetery markers, creating artwork.