Know all about Andesite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Andesite and Obsidian belong to Igneous Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Obsidian is Glassy. Andesite appears Dull and Soft and Obsidian appears Shiny. The luster of Andesite and Obsidian is vitreous. Andesite is available in bluish - grey, grey, pink, yellow colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Obsidian are creating artwork, mirror, used in aquariums.