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