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