pigeonite वाक्य
उदाहरण वाक्य
मोबाइल
- In slowly cooled intrusive igneous rocks, pigeonite is rarely preserved.
- At lower temperatures, pigeonite is unstable relative to augite plus orthopyroxene.
- Quartz is absent, as are orthopyroxene and pigeonite.
- Pigeonite is a mineral in the Clinopyroxene group.
- Olivine may also be a phenocryst, and when present, may have rims of pigeonite.
- Pigeonite can be seen in the lower portion of the Mg-Fe-Ca Pyroxene quadralateral.
- It was discovered in 1982 during the chemical analysis of The North Haig olivine pigeonite achondrite ( ureilite ).
- Pigeonite crystallizes in the monoclinic system, as does augite, and a miscibility gap exists between the two minerals.
- Pigeonite is found as phenocrysts in volcanic rocks on Earth and as crystals in meteorites from Mars and the Moon.
- In tholeiitic basalt, pyroxene ( augite and orthopyroxene or pigeonite ) and calcium-rich plagioclase are common phenocryst minerals.
- Pigeonite is named for its type locality on Lake Superior's shores at Pigeon Point, Minnesota, United States.
- It forms complete solid solution series with hedenbergite ( FeCaSi 2 O 6 ) and augite, and partial solid solutions with orthopyroxene and pigeonite.
- Slow cooling allots the calcium the necessary time to separate itself from the structure to form exsolution lamellae of calcic clinopyroxene, leaving no pigeonite present.
- Component chemicals found at Lascar include : anorthite, augite bordering on diopside, bronzite, fassaite, forsterite, hypersthene, pigeonite, and more.
- Primary ( magmatic ) mineral species also encountered in komatiites include olivine, the pyroxenes augite, pigeonite and bronzite, plagioclase, chromite, ilmenite and rarely pargasitic amphibole.
- Other silicates were detected as well, such as the Magnesium-rich end-member of olivine called forsterite, pigeonite, plagioclase, augite, clinopyroxene, and orthopyroxene.
- The groundmass contains interstitial quartz or tridymite or cristobalite . " Olivine tholeiite " has augite and orthopyroxene or pigeonite with abundant olivine, but olivine may have rims of pyroxene and is unlikely to be present in the groundmass.
- The low-temperature limit of pigeonite stability depends upon the Fe / Mg ratio in the mineral and is hotter for more Mg-rich compositions; for a Fe / Mg ratio of about 1, the temperature is about 900 �C . The presence of pigeonite in an igneous rock thus provides evidence for the crystallization temperature of the magma, and hence indirectly for the water content of that magma.
- The low-temperature limit of pigeonite stability depends upon the Fe / Mg ratio in the mineral and is hotter for more Mg-rich compositions; for a Fe / Mg ratio of about 1, the temperature is about 900 �C . The presence of pigeonite in an igneous rock thus provides evidence for the crystallization temperature of the magma, and hence indirectly for the water content of that magma.
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