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- niigataensis Pseudogaudryina oga Pseudogaudryina pacifica Pseudogaudryina phenocrysta Pseudogaudryina pyramidata Pseudogaudryina vicentina Loeblich, A.R.,…4 kB (262 palabras) - 13:34 19 abr 2022
Resultados de la Wikipedia en inglés.
- A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous…10 kB (1155 palabras) - 00:27 20 nov 2023
- layers of materials. Porphyritic texture is one in which larger pieces (phenocrysts) are embedded in a background mass made of much finer grains. Fragmental…18 kB (2304 palabras) - 09:40 23 sep 2023
- partially resorbed phenocrysts or an accessory phase in basalts generated at depth. Phlogopite mica is a commonly known phenocryst and groundmass phase…7 kB (631 palabras) - 21:00 9 ene 2024
- crystals (phenocrysts) formed prior to the extrusion that brought the magma to the surface, embedded in a finer-grained matrix. These phenocrysts usually…69 kB (7757 palabras) - 15:00 25 abr 2024
- crystals (phenocrysts) of plagioclase formed prior to the extrusion that brought the magma to the surface, embedded in a finer-grained matrix. Phenocrysts of…25 kB (2761 palabras) - 14:38 2 mar 2024
- glass in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are identifiable…22 kB (2430 palabras) - 23:08 6 mar 2024
- common in American usage, while amygdale is more common in British usage. Phenocryst – Crystal larger than the rock grains that surround it in an igneous rock…2 kB (157 palabras) - 14:05 27 jul 2023
- difference in the size of mineral crystals, with the larger crystals known as phenocrysts. Both extrusive and intrusive rocks can be porphyritic, meaning all types…5 kB (486 palabras) - 09:13 21 ene 2024
- during eruption. Any larger crystals visible to the human eye, called phenocrysts, form earlier while slowly cooling in the magma reservoir. When igneous…6 kB (575 palabras) - 14:08 27 jul 2023
- rocks – An ultramafic, ultrapotassic intrusive rock dominated by mafic phenocrysts in a feldspar groundmass Latite – Type of volcanic rock – A silica-undersaturated…14 kB (2209 palabras) - 23:33 16 abr 2024
- may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such…6 kB (629 palabras) - 17:45 27 ene 2024
- peppering the lighter color minerals. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as…56 kB (6508 palabras) - 01:25 2 abr 2024
- found in spinel dunite xenoliths from La Palma, Canary Islands. Ecuador: Phenocrysts found in alkaline extrusive rocks (tephrite), product of effusive volcanism…13 kB (1302 palabras) - 17:20 19 abr 2024
- coarse-grained, porphyritic rock with rounded olivine phenocrysts (1 mm) and subhedral zoned pyroxene phenocrysts (0.5–2 mm) set in a matrix of poikilitic plagioclase…4 kB (354 palabras) - 04:30 9 feb 2024
- tendency to form phenocrysts. Higher iron and magnesium tends to manifest as a darker groundmass, including amphibole or pyroxene phenocrysts. Mafic or basaltic…56 kB (6577 palabras) - 21:39 17 abr 2024
- pyroxene (augite or enstatite). The quartz appears as rounded, corroded phenocrysts, or as an element of the ground-mass. The plagioclase in dacite ranges…17 kB (1883 palabras) - 16:17 5 abr 2024
- difference in size between the tiny matrix crystals and the much larger phenocrysts. Porphyries may be aphanites or phanerites, that is, the groundmass may…26 kB (3024 palabras) - 14:16 9 mar 2024
- biotite found in its volcanic equivalent, rhyolite. Biotite is an essential phenocryst in some varieties of lamprophyre. Biotite is occasionally found in large…16 kB (1663 palabras) - 20:44 18 ene 2024
- porphyry. Porphyritic texture develops when the larger crystals, called phenocrysts, grow to considerable size before the main mass of the magma crystallizes…48 kB (5657 palabras) - 16:36 13 abr 2024
- Rhomb porphyry is an example with usually large porphyritic rhomb shaped phenocrysts embedded in a very fine-grained matrix. Some of the best known trachytes…19 kB (2091 palabras) - 18:40 23 mar 2024
- (SiO2=bulk 67.5–68.5% (dacite), matrix 75–76% (rhyolite) and consistent phenocryst content (35–50%) and mineralogical composition (plagioclase, sanidine…3 kB (321 palabras) - 05:38 4 ene 2023