Know all about Lignite and Trondhjemite properties here. All properties of rocks are important as they define the type of rock and its application. Lignite belongs to Sedimentary Rocks while Trondhjemite belongs to Igneous Rocks.Texture of Lignite is Amorphous, Glassy whereas that of Trondhjemite is Phaneritic. Lignite appears Veined or Pebbled and Trondhjemite appears Banded and Foilated. The luster of Lignite is dull to vitreous to submetallic while that of Trondhjemite is subvitreous to dull. Lignite is available in black, brown, dark brown, grey, light to dark grey colors whereas Trondhjemite is available in black, brown, light to dark grey, white colors. The commercial uses of Lignite are electricity generation and that of Trondhjemite are cemetery markers, creating artwork.