Porphyry (geology) - Wikipedia Porphyry ( ˈpɔːrfəri 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
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 [1] matrix or groundmass The larger crystals are called phenocrysts In its traditional, non-geologic use, the term "porphyry" refers to the purple-red form of this stone, valued for its appearance
Porphyry Deposits - Geology Science Porphyry deposits are formed through a combination of geological processes that take place over long periods of time These processes include magmatism, hydrothermal activity, and the interaction of mineral-rich fluids with the surrounding rock
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 In Geology and Rock Examples? | Earth Know A porphyry (plural porphyries) is an igneous rock with large, well-formed mineral grains set in a finer-grained matrix Such rocks have two distinctive crystal sizes: large and small
Porphyry: Mineral information, data and localities. 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 of Tyre - Wikipedia The Introduction describes how qualities attributed to things may be classified, famously breaking down the philosophical concept of substance into the five components genus, species, difference, property, and accident Porphyry's discussion of accident sparked a long-running debate on the application of accident and essence [17]
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