Know all about Picrite and Coquina properties here. All properties of rocks are important as they define the type of rock and its application. Picrite belongs to Igneous Rocks while Coquina belongs to Sedimentary Rocks.Texture of Picrite is Earthy, Rough whereas that of Coquina is Clastic. Picrite appears Rough and Shiny and Coquina appears Layered, Banded, Veined and Shiny. The luster of Picrite is subvitreous to dull while that of Coquina is dull to vitreous to submetallic. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Coquina is available in beige, buff, orange 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 Coquina are creating artwork.