Know all about Obsidian and Chert properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian belongs to Igneous Rocks while Chert belongs to Sedimentary Rocks.Texture of Obsidian is Glassy whereas that of Chert is Banded, Rough. Obsidian appears Shiny and Chert appears Glassy or Pearly. The luster of Obsidian is vitreous while that of Chert is waxy and dull. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Chert 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 Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms.