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