Know all about Banded iron formation and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Banded iron formation belongs to Sedimentary Rocks while Picrite belongs to Igneous Rocks.Texture of Banded iron formation is Banded, Trellis whereas that of Picrite is Earthy, Rough. Banded iron formation appears Layered, Banded, Veined and Shiny and Picrite appears Rough and Shiny. The luster of Banded iron formation is earthy while that of Picrite is subvitreous to dull. Banded iron formation is available in red, reddish brown colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Banded iron formation are as a touchstone, cemetery markers, creating artwork and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).