mining porphyritic texture


Porphyry (geology) - Wikipedia

The term porphyry is also used for a mineral deposit called a "copper porphyry". 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.. 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 texture - ALEX STREKEISEN

Porphyritic texture Porphyritic texture is an igneous rock texture in which large crystals are set in a finer-grained or glassy groundmass. Porphyritic textures occur in coarse, medium and fine-grained igneous rocks. Usually the larger crystals, known as phenocrysts, …

Types of Porphyritic Rocks - Mineral Processing & Metallurgy

Porphyry. — This name refers to the structure, which is formed of larger crystals set in a fine-grained or glassy ground-mass. The porphyritic structure may be plainly visible, the larger crystals being easily seen (phenocrysts), or it may require the microscope to bring it out. Porphyritic structure may appear in any igneous rock, but the true porphyries are rocks in which there is a marked ...

Porphyritic Granite

Name: Porphyritic Granite: Texture: Porphyritic: Origin: Intrusive/Plutonic: Chemical Composition: Felsic: Color: Predominantly pink: Mineral Composition: Potassium ...

Porphyritic granite: Mineral information, data and localities.

A granite exhibiting porphyritic texture. Essential minerals - these are minerals that are required within the classification of this rock:

Phenocryst & Porphyritic Textures | Science Trends

Aug 15, 2017 · A porphyritic texture is the texture of a rock with large phenocrysts and a background matrix of smaller crystals. To form this crystal contrast of smaller and larger minerals the rock likely went through different stages of cooling that formed different sizes of minerals.

Porphyry | geological feature | Britannica

Porphyry. Rocks have many different textures. Layered sandstone produces a gritty texture, whereas coquina may be rough with cemented shells occasionally producing a sharp edge. Likewise, breccia, which contains pieces of other rocks that have been cemented together, and porphyry, which contains interlocking mineral crystals, tend to be rough.

Porphyritic Texture | Geology Fundamentals | FANDOM ...

A porphyritic texture is a a texture with two or more distinct sizes of grains.. It can form from two stages of cooling, i.e. slow cooling to grow a few large crystals, followed by rapid cooling to grow many smaller crystals.Single stage cooling can also produce a porphyritic texture. In a porphyritic texture, the larger grains are called phenocrysts and the material surrounding the the ...

PORPHYRITIC COPPER | Fidelity Minerals

Porphyritic copper mineralization identified at two key mineralized zones approximately 4,000m apart. Historical sampling at the project indicates peak mineralization grades of: between 0.36% - 0.66% Cu at the Upper Zone. and higher grades of >1% Cu at the Lower Zone. Potential that the two mineralised zones represent exposed sections of a typical Cu-Mo Porphyry system.

Geology Fundamentals: Identifying Igneous Rocks in the ...

Oct 17, 2019 · These rocks exhibit intermediate grain size and often a porphyritic texture. Magmas emplaced near the surface cool relatively quickly, hence hypabyssal rocks are believed to be the transitional rocks between the intrusive and extrusive.

Santa Lucía Project | jcmining

Porphyritic texture with feldspar, quartz, amphibole and biotite phenocrysts, potassium alteration with Euhedral orthoclase phenoscristals. Vetilleo quartz and local areas of stockworks. Mineralization of pyrite, chalcopyrite, bornite, molybdenite. Oxides of goethite, hematite, jarosite, turjite and traces of gold. Granodiorite amphibole-magnetite

Porphyry may refer to: Porphyritic, the general igneous text

Porphyry may refer to: Porphyritic, the general igneous texture of a rock with two distinct crystal phenocryst sizes Porphyry geology, an igneous rock with large crystals in a fine-grained matrix and important Roman building material Porphyry Mountain in Alaska Porphyry, a system of astrological house division Porphyry copper deposit, a primary low grade ore deposit of copper, consisting of ...

Porphyritic | Definition of Porphyritic at

Porphyritic definition, of, pertaining to, containing, or resembling porphyry, its texture, or its structure. See more.

Porphyry - Igneous Rocks

It is often assumed that phenocrysts that form the porphyritic texture must be felsic (feldspars (preferably alkali feldspars) or quartz). The green mineral here is olivine . But it does meet the most important and universal characteristics of porphyritic rocks — it is …

Porphyritic Textures with Fine-Grained Groundmasses

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

Porphyritic - Wikipedia

Porphyritic texture in a granite. This is an intrusive porphyritic rock. The white, square feldspar phenocrysts are much larger than crystals in the surrounding matrix; eastern Sierra Nevada, Rock Creek Canyon, California.

What is porphyritic andesite?

Porphyritic textures develop when conditions during cooling of a magma change relatively quickly. The earlier formed minerals will have formed slowly and remain as large crystals, whereas, sudden cooling causes the rapid crystallization of the remainder of the melt into a fine grained (aphanitic) matrix.

PORPHYRITIC GRANITE . Porphyritic granite has the same chemistry & mineralogy as ordinary granite, but differs in the size range of its crystals. Granites are coarsely crystalline igneous rocks, having a phaneritic texture. Porphyritic granites have a mix of large …

Igneous rocks -

Feb 25, 2017 · Granite is a felsic intrusive igneous rock and has either a phaneritic or porphyritic texture. Granite cools very slowly and often forms large masses of rock that are referred to as plutons or batholiths. Granite usually contains about 20-50% quartz, 30-60% feldspar, and the remaining 5-10% darker minerals such as biotite. The quartz grains are usually spherical in shape and are a white to …

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