Know all about Chert and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Chert belongs to Sedimentary Rocks while Picrite belongs to Igneous Rocks.Texture of Chert is Banded, Rough whereas that of Picrite is Earthy, Rough. Chert appears Glassy or Pearly and Picrite appears Rough and Shiny. The luster of Chert is waxy and dull while that of Picrite is subvitreous to dull. Chert is available in black, brown, green, grey, red, white colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).