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