Know all about Tachylite and Chert properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite belongs to Igneous Rocks while Chert belongs to Sedimentary Rocks.Texture of Tachylite is Vitreous whereas that of Chert is Banded, Rough. Tachylite appears Glassy and Chert appears Glassy or Pearly. The luster of Tachylite is resinous while that of Chert is waxy and dull. Tachylite is available in black, dark brown colors whereas Chert is available in black, brown, green, grey, red, white colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms.