Know all about Diatomite and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Diatomite belongs to Sedimentary Rocks while Picrite belongs to Igneous Rocks.Texture of Diatomite is Clastic or Non-Clastic whereas that of Picrite is Earthy, Rough. Diatomite appears Soft and Picrite appears Rough and Shiny. The luster of Diatomite is dull while that of Picrite is subvitreous to dull. Diatomite is available in grey, white, yellow colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Diatomite are alumina refineries, animal feed filler, as a feed additive for livestock, creating artwork, drawing on blackboards, fire resistant, gymnasts, athletes and mountain climbers use for grip, in aquifers, soil conditioner, to ignite fire, used as a filter medium, used as an insecticide, whiting material in toothpaste, paint and paper and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).