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