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