Know all about Gossan and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Gossan belongs to Metamorphic Rocks while Picrite belongs to Igneous Rocks.Texture of Gossan is Rough, Sandy whereas that of Picrite is Earthy, Rough. Gossan appears Dull and Banded and Picrite appears Rough and Shiny. The luster of Gossan is metallic while that of Picrite is subvitreous to dull. Gossan is available in brown, brown- black, gold, green, rust colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Gossan are cemetery markers, commemorative tablets, gemstone and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).