Know all about Trondhjemite and Marl properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite belongs to Igneous Rocks while Marl belongs to Sedimentary Rocks.Texture of Trondhjemite is Phaneritic whereas that of Marl is Earthy. Trondhjemite appears Banded and Foilated and Marl appears Rough and Dull. The luster of Trondhjemite is subvitreous to dull while that of Marl is dull. Trondhjemite is available in black, brown, light to dark grey, white colors whereas Marl is available in beige, brown, green, grey, white colors. The commercial uses of Trondhjemite are cemetery markers, creating artwork and that of Marl are creating artwork, soil conditioner.