Know all about Trondhjemite and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite and Porphyry belong to Igneous Rocks.Texture of Trondhjemite is Phaneritic whereas that of Porphyry is Porphyritic. Trondhjemite appears Banded and Foilated and Porphyry appears Dull. The luster of Trondhjemite is subvitreous to dull while that of Porphyry is dull. Trondhjemite is available in black, brown, light to dark grey, white colors whereas Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses of Trondhjemite are cemetery markers, creating artwork and that of Porphyry are creating artwork, gemstone, jewelry.