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