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