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