Is Porphyry 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.

Is porphyry granite.

Porphyry has been used as a paving surface as far back as the roman era. Porphyry copper deposits and read more. Traditional porphyry is a variable thickness stone. Porphyry definition is a rock consisting of feldspar crystals embedded in a compact dark red or purple groundmass.

The word porphyry comes from the latin word for purple which was the color of nobility to the romans. Granitoid is a general descriptive field term for lighter colored coarse grained igneous rocks. A granitic rock with a porphyritic texture is known as a granite porphyry. It forms from the slow crystallization of magma below earth s surface.

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 is a diversity of igneous rock consisting of large grained crystal such as quartz and feldspar scattered in a fine grained groundmass. Porphyry is an igneous rock characterized by porphyritic texture. 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. Petrographic examination is required for identification of specific types of granitoids. It s a type of granite that has naturally extruded through the earth s crust. Porphyry is an igneous rock that contains larger crystals phenocrysts in a fine grained groundmass.

K feldspar phenocrysts in this sample. The groundmass is composed of indistinguishable crystals aphanites as in basalt or easily distinguishable crystals phanerites as in granite. Properties of rock is another aspect for granite vs porphyry. The extrusive igneous rock equivalent of granite is rhyolite.

Porphyritic texture is a very common texture in igneous rocks in which larger crystals phenocrysts are embedded in a fine grained groundmass. Granite is available in black grey orange pink white colors whereas porphyry is available in black brown colourless green grey red rust white colors. Hardness of granite and porphyry is 6 7. Porphyritic refers to the texture of the rocks.

Appearance of granite is veined or pebbled and that of porphyry is dull.