Know all about Obsidian and Flint properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian belongs to Igneous Rocks while Flint belongs to Sedimentary Rocks.Texture of Obsidian is Glassy whereas that of Flint is Banded, Rough. Obsidian appears Shiny and Flint appears Glassy or Pearly. The luster of Obsidian and Flint is vitreous. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Flint is available in black, brown, green, grey, red, white colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums 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.