Know all about Phyllite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Phyllite belongs to Metamorphic Rocks while Tachylite belongs to Igneous Rocks.Texture of Phyllite is Phyllitic Sheen, Slaty whereas that of Tachylite is Vitreous. Phyllite appears Crinkled or Wavy and Tachylite appears Glassy. The luster of Phyllite is phyllitic while that of Tachylite is resinous. Phyllite is available in black to grey, light greenish grey colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Phyllite and Tachylite are cemetery markers, commemorative tablets, creating artwork, writing slates.