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