Porphyry (geology) - Wikipedia Porphyry ( ˈ p ɔːr f ə r i POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass
What Is Porphyry? How Does It Form, and In Which Rocks? Porphyry (pronounced as POR-fə-ree) describes any intrusive or extrusive igneous texture rock with large-grained crystals embedded in a finer-grain matrix The finer-grained groundmass or matrix can be aphanitic or phaneritic However, the larger crystals must be easily noticed and distinguishable
Porphyry (geology) - New World Encyclopedia Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass The larger crystals are called phenocrysts
Porphyry Deposits - Geology Science Porphyry deposits are a type of mineral deposit that form from large-scale hydrothermal systems associated with intrusive igneous rocks They are characterized by the presence of porphyritic rocks that contain large crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass)
Porphyry - Igneous Rocks - Sandatlas Porphyry is an igneous rock characterized by porphyritic texture Porphyritic texture is a very common texture in igneous rocks in which larger crystals (phenocrysts) are embedded in a fine-grained groundmass
Porphyry | geological feature | Britannica (A porphyry is an igneous rock containing conspicuous crystals, called phenocrysts, surrounded by a matrix of finer-grained minerals or glass or both ) In most rocks, both alkali and plagioclase feldspars occur as irregularly shaped grains with only a few or no crystal faces
Porphyry: Mineral information, data and localities. - mindat. org The rock name descriptive of the groundmass composition usually precedes the term; e g , diorite porphyry In many cases the main phenocryst minerals precedes the name, e g quartz porphyry or quartz-feldspar porphyry Porphyrite is a mostly obsolete variety with dominant plagioclase phenocrysts
Porphyry - Wikipedia Porphyry (geology), an igneous rock with large crystals in a fine-grained matrix, often purple, and prestigious Roman sculpture material; Shoksha porphyry, quartzite of purple color resembling true porphyry mined near the village of Shoksha, Karelia, Russia; Porphyritic, the general igneous texture of a rock with two distinct crystal
Porphyritic - Wikipedia Andesite porphyry from summit of O'Leary Peak This is an extrusive porphyritic rock, as the pink (and black) phenocrysts are clearly visible, in contrast to the grey groundmass with its microscopic crystals