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