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