Know all about Rhomb Porphyry and Nepheline Syenite properties here. All properties of rocks are important as they define the type of rock and its application. Rhomb Porphyry and Nepheline Syenite belong to Igneous Rocks.Texture of Rhomb Porphyry is Aphanitic to Porphyritic whereas that of Nepheline Syenite is Granular. Rhomb Porphyry appears Rough and Nepheline Syenite appears Banded and Foilated. The luster of Rhomb Porphyry is subvitreous to dull while that of Nepheline Syenite is greasy to dull. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors whereas Nepheline Syenite is available in brown, buff, cream, green, grey, pink, 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 Nepheline Syenite are cemetery markers, creating artwork.