oligoclase वाक्य
उदाहरण वाक्य
मोबाइल
- Oligoclase is a high sodium feldspar crystallizing in the triclinic system.
- The distinctive texture of rapakivi granite is due to oligoclase rims on orthoclase phenocrysts.
- The accessory minerals of these rocks are principally oligoclase, muscovite, apatite and zircon.
- Oligoclase is also found in metamorphic rocks formed under transitional greenschist to amphibolite facies conditions.
- The feldspar is usually orthoclase, but can also be albite, oligoclase or microcline.
- The main feldspar in mugearite is oligoclase.
- Its reddish mass includes large crystals of potassium feldspar surrounded by green rings of oligoclase.
- "' Oligoclase "'is a rock-forming mineral belonging to the plagioclase feldspars.
- The feldspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
- The feldspar of the granulites is mostly orthoclase or cryptoperthite; microcline, oligoclase and albite are also common.
- Oligoclase occurs, often accompanying orthoclase, as a constituent of plutonic igneous rocks such as granite, syenite, and diorite.
- This is coloured yellow brown to pink and contains fine crystals of perthite, and oligoclase and quartz, coloured by limonite.
- The mineral content and elemental abundance indicates " Jake M " rock may be a mugearite, a sodium rich oligoclase-bearing basaltic trachyandesite.
- The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is sometimes seen in orthoclase : hence two kinds of sunstone are distinguished as " oligoclase sunstone " and " orthoclase sunstone ."
- The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is sometimes seen in orthoclase : hence two kinds of sunstone are distinguished as " oligoclase sunstone " and " orthoclase sunstone ."
- This leads via the replacement of primary K-feldspar ( perthitic and non-perthitic microcline ) to the formation of plagioclase ( albite or oligoclase ) and in certain places also to the formation of myrmekite.
- For example, the plagioclase feldspars comprise a continuous series from sodium-rich end member albite ( NaAlSi 3 O 8 ) to calcium-rich anorthite ( CaAl 2 Si 2 O 8 ) with four recognized intermediate varieties between them ( given in order from sodium-to calcium-rich ) : oligoclase, andesine, labradorite, and bytownite.
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