Porphyritic Texture Rock

The term porphyry is also used for a mineral deposit called a copper porphyry. There are nine main types of igneous rock textures. Aphanitic a not phaner visible rocks in contrast to phaneritic rocks typically form.

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Many rocks with an overall fine grained texture display scattered minerals that are more than 1 mm across.

Porphyritic texture rock. Porphyritic texture is really a subtype but usage of the term often confuses the beginner. Porphyritic rocks are composed of at least two minerals having a conspicuous large difference in grain size. The extra large mineral grains are called phenocrysts. Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic.

Igneous textures include the rock textures occurring in igneous rocks igneous textures are used by geologists in determining the mode of origin igneous rocks and are used in rock classification. Porphyritic texture is a very common texture in igneous rocks in which larger crystals phenocrysts are embedded in a fine grained groundmass. A porphyritic texture is displayed in an igneous rock containing large isolated crystals phenocrysts in a mass of fine textured crystals. There are six main types of textures.

Phaneritic vesicular aphanitic porphyritic poikilitic glassy pyroclastic equigranular and spinifex. Porphyry is an igneous rock characterized by porphyritic texture. Porphyritic textures occur in coarse medium and fine grained igneous rocks. Feldspars augite and hornblende commonly show rectangular crystal shapes whereas.

Each kind of texture has a variety of different characteristics that make them unique. Larger scale features such as fractures and layering are considered rock structures in comparison. This porphyritic texture indicates that the magma sat and cooled a bit below the earth s surface thus giving time for the large crystals to grow before erupting onto the surface and cooling very quickly. Porphyritic rocks the two images below show a hand sample and a thin section of porphyritic aphanitic textured rocks.

A porphyritic texture displays minerals in two distinct size populations. The different stages of cooling that create porphyritic textures in intrusive and hypabyssal porphyritic rocks also lead to a separation of dissolved metals into distinct zones. One or more minerals are consistently larger than the rest of the minerals in a rock. Porphyry is an igneous rock that contains larger crystals phenocrysts in a fine grained groundmass.

K feldspar phenocrysts in this sample. This process which occurs primarily when fluids are driven off the cooling magma is one of the main reasons for the existence in the. Porphyritic is an adjective used in geology specifically for igneous rocks for a rock that has a distinct difference in the size of the crystals with at least one group of crystals obviously larger than another group. Usually the larger crystals known as phenocrysts formed earlier in the crystallisation sequence of the magma.

Porphyritic rocks may be aphanites or extrusive rock with large crystals or phenocrysts floating in a fine grained groundmass of non visible crystals as in a porphyritic. Porphyritic texture porphyritic texture is an igneous rock texture in which large crystals are set in a finer grained or glassy groundmass. The large crystals are termed phenocrysts while the aphanitic rest of rock is. Porphyritic texture indicates that a magma has gone.