Is Porphyry Granite

Porphyritic texture is a very common texture in igneous rocks in which larger crystals phenocrysts are embedded in a fine grained groundmass.

Is porphyry granite.

It s a type of granite that has naturally extruded through the earth s crust. Porphyry copper deposits and read more. 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. K feldspar phenocrysts in this sample.

Hardness of granite and porphyry is 6 7. 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. The groundmass is composed of indistinguishable crystals aphanites as in basalt or easily distinguishable crystals phanerites as in granite.

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. 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 definition is a rock consisting of feldspar crystals embedded in a compact dark red or purple groundmass. Porphyry has been used as a paving surface as far back as the roman era.

Porphyritic refers to the texture of the rocks. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye. The word porphyry comes from the latin word for purple which was the color of nobility to the romans. Properties of rock is another aspect for granite vs porphyry.

A granitic rock with a porphyritic texture is known as a granite porphyry. Porphyry is a diversity of igneous rock consisting of large grained crystal such as quartz and feldspar scattered in a fine grained groundmass. Appearance of granite is veined or pebbled and that of porphyry is dull. The romans used it because it had a naturally flat durable surface and the stone was easy to quarry.

Porphyry is an igneous rock similar in composition to granite. 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. The extrusive igneous rock equivalent of granite is rhyolite. Petrographic examination is required for identification of specific types of granitoids.

It forms from the slow crystallization of magma below earth s surface.