phenocryst การใช้

• At the top left is a distinct phenocryst of plagioclase . ]]
• Three types of rocks are distinguished by texture and mineral and phenocryst content.
• Olivine may also be a phenocryst, and when present, may have rims of pigeonite.
• Complex phenocryst assemblages found in a sample indicate that the magma formation is a complex process.
• Calc-alkaline phenocryst-rich dacite, andesite and rhyolite rocks are abundant in continental arc.
• Phenocryst composition in the rocks varies, encompassing olivine, orthopyroxene, plagioclase and small amounts of biotite.
• Trachybasalts are in the form of two textural types; phenocryst-rich lava flows and fragmental flow agglomerates.
• A similar type of crystal is a " phenocryst ", a large crystal in an igneous rock.
• Aside from the lower phenocryst content, this lava is very similar to Morro Negro, another Pacana lava dome.
• In tholeiitic basalt, pyroxene ( augite and orthopyroxene or pigeonite ) and calcium-rich plagioclase are common phenocryst minerals.
• The most abundant phenocryst minerals were hornblende and plagioclase, but an unusual phenocryst mineral was also present the calcium sulfate, anhydrite.
• The most abundant phenocryst minerals were hornblende and plagioclase, but an unusual phenocryst mineral was also present the calcium sulfate, anhydrite.
• High in fiamme, the third tuff layer differs from the second in that it has even higher phenocryst content, but poor lithics.
• A "'phenocryst "'is a relatively large and usually conspicuous crystal distinctly larger than the grains of the rock recrystallization.
• Normally the term " phenocryst " is not used unless the crystals are directly observable, which is sometimes stated as greater than . 5 millimeter in diameter.
• Chemical classifications are preferred to classify volcanic rocks, with phenocryst species used as a prefix, e . g . " olivine-bearing picrite " or " orthoclase-phyric rhyolite ".
• Oroscocha is formed by phenocryst-rich, felsic porphyritic rocks with a composition of peraluminous rhyolite in the flows and trachydacite in the dome, of which the dome is darker than the lava flows.
• Iddingsite forms from the weathering of basalt in the presence of liquid water and can be described as a phenocryst, i . e . it has megascopically visible crystals in a fine-grained groundmass of a porphyritic rock.
• In some cases, felsic volcanic rocks may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such as'hornblende-bearing felsite '.
• The above approach of FTIR has successfully detect the occurrence of H 2 O and CO 2 in numbers of studies nowaday, For examples, the water saturated inclusion in olivine phenocryst erupted at Stromboli ( Sicily, Italy ) in consequences of depressurization, and the unexpected of occurrence of molecular CO 2 in melts inclusion in Phlegraean Volcanic District ( Southern Italy ) revealed as the presence of a deep, CO 2-rich, continuous degassing magma.