Know all about Picrite and Tonalite properties here. All properties of rocks are important as they define the type of rock and its application. Picrite and Tonalite belong to Igneous Rocks.Texture of Picrite is Earthy, Rough whereas that of Tonalite is Phaneritic. Picrite appears Rough and Shiny and Tonalite appears Banded and Foilated. The luster of Picrite and Tonalite is subvitreous to dull. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Tonalite is available in black, brown, light to dark grey, white 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 Tonalite are cemetery markers, creating artwork.