Porphyry Granite

Porphyry is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass. In its non-geologic, traditional use, the term porphyry usually refers to the purple-red form of this stone, valued for its appearance. But other colours of decorative porphyry also used such as “green”, “black” and “grey”.

The term is from the Ancient Greek porphyra, meaning “purple”. Purple was the colour of royalty, and the Roman “imperial porphyry” was a deep purple igneous rock with large crystals of plagioclase. Some authors claimed the rock the hardest known in antiquity. Thus porphyry prized for monuments and building projects in Imperial Rome and thereafter.

Subsequently, the name given to any igneous rocks with large crystals. The adjective porphyritic now refers to a certain texture of igneous rock regardless of its chemical and mineralogical composition or its color. Its chief characteristic is a large difference in size between the tiny matrix crystals and the much larger phenocrysts.