Know all about Claystone and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Claystone belongs to Sedimentary Rocks while Picrite belongs to Igneous Rocks.Texture of Claystone is Clastic whereas that of Picrite is Earthy, Rough. Claystone appears Rough and Dull and Picrite appears Rough and Shiny. The luster of Claystone is dull while that of Picrite is subvitreous to dull. Claystone is available in black, blue, brown, green, grey, orange, red, white, yellow colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Claystone are pottery and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).