Know all about Rhomb Porphyry and Trondhjemite properties here. All properties of rocks are important as they define the type of rock and its application. Rhomb Porphyry and Trondhjemite belong to Igneous Rocks.Texture of Rhomb Porphyry is Aphanitic to Porphyritic whereas that of Trondhjemite is Phaneritic. Rhomb Porphyry appears Rough and Trondhjemite appears Banded and Foilated. The luster of Rhomb Porphyry and Trondhjemite is subvitreous to dull. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors whereas Trondhjemite is available in black, brown, light to dark grey, white colors. The commercial uses of Rhomb Porphyry are an oil and gas reservoir, as a feed additive for livestock, metallurgical flux, soil conditioner, source of magnesia (mgo) and that of Trondhjemite are cemetery markers, creating artwork.