Know all about Phonolite and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Phonolite and Picrite belong to Igneous Rocks.Texture of Phonolite is Granular whereas that of Picrite is Earthy, Rough. Phonolite appears Banded and Foilated and Picrite appears Rough and Shiny. The luster of Phonolite is greasy to dull while that of Picrite is subvitreous to dull. Phonolite is available in brown, buff, cream, green, grey, pink, white colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Phonolite are 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).