Know all about Phyllite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Phyllite belongs to Metamorphic Rocks while Obsidian belongs to Igneous Rocks.Texture of Phyllite is Phyllitic Sheen, Slaty whereas that of Obsidian is Glassy. Phyllite appears Crinkled or Wavy and Obsidian appears Shiny. The luster of Phyllite is phyllitic while that of Obsidian is vitreous. Phyllite is available in black to grey, light greenish grey colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Phyllite are cemetery markers, commemorative tablets, creating artwork, writing slates and that of Obsidian are creating artwork, mirror, used in aquariums.