Rocks are naturally occurring solids which are composed of minerals & have been used by humans since ages. From Stone Age, rocks are used for various purposes. Also, the metals and minerals found in rock play an important role in our life. Get to know all the Rhomb Porphyry Uses. We have provided you with all information about Rhomb Porphyry rock here. Rhomb-porphyry is a porphyritic igneous rock with abundant wedge or lens shaped anorthoclase or feldspar phenocrysts. Rhomb Porphyry is available in black, brown, colourless, green, grey, pink, white colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Rhomb Porphyry is white. Get to know more about Rhomb Porphyry rock and characteristics of Rhomb Porphyry rock in the next sections.