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igneous rocks: texture and classification | geology

igneous rocks: texture and classification | geology

The Porphyritic Texture is characterised by the presence of a few conspicuously large sized crystals (the phenocrysts) which are embedded in a fine-grained ground mass or matrix. The texture is sometimes further distinguished into mega-porphyritic and microporphyritic depending upon the size of the phenocrysts. Porphyritic texture may be caused by any one or more of the …

porphyritic texture | article about porphyritic texture by

porphyritic texture | article about porphyritic texture by

the texture of a rock in which relatively large phenocrysts with regular crystal faces are set in a generally fine-grained groundmass. Rocks with porphyritic textures may be extrusive or intrusive. An extrusive rock with a porphyritic texture has a groundmass that contains an unequal number of phenocrysts and consists of either microlites or glass

porphyritic copper | fidelity minerals

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

porphyry - igneous rocks

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 igneous and some minerals are clearly larger than the groundmass

porphyritic granite, stretcher architextures

porphyritic granite, stretcher architextures

A seamless stone texture with porphyritic granite blocks arranged in a stretcher pattern. The image represents a physical area of 832 x 815 mm (32.8 x 32.1 inches) in total, with each individual block measuring approximately 400 x 200 mm (15.7 x 7.9 inches). The joints are filled with mortar and are 8 mm (0.3 inches) in width

porphyritic granite, herringbone architextures

porphyritic granite, herringbone architextures

A seamless stone texture with porphyritic granite blocks arranged in a herringbone pattern. The image represents a physical area of 3224 x 2544 mm (126.9 x 100.2 inches) in total, with each individual block measuring approximately 750 x 50 mm (29.5 x 2 inches). The joints are filled with rough concrete and are 10 mm (0.4 inches) in width

geology fundamentals: identifying igneous rocks in the

geology fundamentals: identifying igneous rocks in the

Jul 10, 2020 · 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. Hypabyssal intrusions occur as volcanic necks, dikes, and sills

porphyritic texture - alex strekeisen

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, formed earlier in the crystallisation sequence of the magma

porphyritic granite, flemish architextures

porphyritic granite, flemish architextures

A seamless stone texture with porphyritic granite blocks arranged in a flemish pattern. The image represents a physical area of 915 x 1009 mm (36 x 39.7 inches) in total, with each individual block measuring approximately 300 x 500 mm (11.8 x 19.7 inches). The joints are filled with mortar and are 5 mm (0.2 inches) in width

porphyritic granite - seamless textures | architextures

porphyritic granite - seamless textures | architextures

A seamless stone texture with a porphyritic granite surface. The image represents a physical area of 1500 x 1191 mm (59.1 x 46.9 inches) in total. Porphyritic granite is a stone material popular within architecture and construction. While possessing the same properties of regular granite, porphyritic granite differs due to the presence of

porphyritic granite, stack - seamless textures | architextures

porphyritic granite, stack - seamless textures | architextures

A seamless stone texture with porphyritic granite blocks arranged in a stack pattern. The image represents a physical area of 1620 x 944 mm (63.8 x 37.2 inches) in total, with each individual block measuring approximately 400 x 100 mm (15.7 x 3.9 inches). The joints are filled with mortar and are 5 mm (0.2 inches) in width

porphyritic granite, chevron architextures

porphyritic granite, chevron architextures

A seamless stone texture with porphyritic granite blocks arranged in a chevron pattern. The image represents a physical area of 1283 x 1229 mm (50.5 x 48.4 inches) in total, with each individual block measuring approximately 200 x 100 mm (7.9 x 3.9 inches). The joints are filled with mortar and are 5 mm (0.2 inches) in width

santa luca project | jcmining

santa luca 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

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