Know all about Rhomb Porphyry and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Rhomb Porphyry and Icelandite belong to Igneous Rocks.Texture of Rhomb Porphyry is Aphanitic to Porphyritic whereas that of Icelandite is Aphanitic to Porphyritic. Rhomb Porphyry appears Rough and Icelandite appears Dull and Soft. The luster of Rhomb Porphyry is subvitreous to dull while that of Icelandite is vitreous. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors whereas Icelandite is available in bluish - grey, grey, pink, yellow 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 Icelandite are cemetery markers, creating artwork.