Is Porphyry Granite

Properties of rock is another aspect for granite vs porphyry.

Is porphyry granite.

Porphyritic refers to the texture of the rocks. Porphyry is a diversity of igneous rock consisting of large grained crystal such as quartz and feldspar scattered in a fine grained groundmass. Granite is composed mainly of quartz and feldspar with minor amounts of mica amphiboles and other minerals this mineral composition usually gives granite a red pink gray or white color with dark mineral. Porphyry is an igneous rock characterized by porphyritic texture.

Porphyry is an igneous rock similar in composition to granite. K feldspar phenocrysts in this sample. Hardness of granite and porphyry is 6 7. Petrographic examination is required for identification of specific types of granitoids.

Granite is available in black grey orange pink white colors whereas porphyry is available in black brown colourless green grey red rust white colors. Porphyry is an igneous rock that contains larger crystals phenocrysts in a fine grained groundmass. Unlike common granites pophyry has large light colored crystals of quartz or feldspar floating in a red or purple fine grained matrix of smaller crystals. Porphyry is a textural term for an igneous rock consisting of large grained crystals such as feldspar or quartz dispersed in a fine grained silicate rich generally aphanitic matrix or groundmass the larger crystals are called phenocrysts in its non geologic traditional use the term porphyry refers to the purple red form of this stone valued for its appearance.

It s a type of granite that has naturally extruded through the earth s crust. Granitoid is a general descriptive field term for lighter colored coarse grained igneous rocks. Among the most distinctive hydrothermal deposits is a class known as porphyry copper deposits so called because they are invariably associated with igneous intrusives that are porphyritic meaning the rock is a mixture of coarse and fine mineral grains. Porphyry copper deposits and read more.

Traditional porphyry is a variable thickness stone. The romans used it because it had a naturally flat durable surface and the stone was easy to quarry. Porphyritic texture is a very common texture in igneous rocks in which larger crystals phenocrysts are embedded in a fine grained groundmass. Appearance of granite is veined or pebbled and that of porphyry is dull.

It forms from the slow crystallization of magma below earth s surface. The word porphyry comes from the latin word for purple which was the color of nobility to the romans. A granitic rock with a porphyritic texture is known as a granite porphyry. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye.

Porphyry has been used as a paving surface as far back as the roman era.