Know all about Trondhjemite and Slate properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite belongs to Igneous Rocks while Slate belongs to Metamorphic Rocks.Texture of Trondhjemite is Phaneritic whereas that of Slate is Foliated. Trondhjemite appears Banded and Foilated and Slate appears Dull. The luster of Trondhjemite is subvitreous to dull while that of Slate is dull. Trondhjemite is available in black, brown, light to dark grey, white colors whereas Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors. The commercial uses of Trondhjemite are cemetery markers, creating artwork and that of Slate are blackboards, commemorative tablets, laboratory bench tops, standard material for the bed of billiard table, standard material for the beds of pool and snooker table, tombstones, used in aquariums, writing slates.