orthoclase वाक्य
उदाहरण वाक्य
मोबाइल
- Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars.
- The " orthoclase sunstone " variant has been found near Amelia Courthouse, Amelia County, Virginia.
- The feldspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
- The orthoclase crystals are interpreted to represent rock fragments that became enveloped during hardening of the dacitic lavas.
- This then causes orthoclase and biotite, both K rich minerals into which Rb can substitute, to precipitate.
- For example, orthoclase is typically feldspar from granite, while its modifications occur in lavas of similar composition.
- The feldspar of the granulites is mostly orthoclase or cryptoperthite; microcline, oligoclase and albite are also common.
- Higher than normal potassium favors the production of orthoclase, which is usually absent from most mafic igneous rocks.
- Of these the former consists of orthoclase, nepheline, sodalite, diopside and aegirine, biotite and sphene.
- The granodiorite has large crystals of biotite, hornblende, and both feldspars & mdash; orthoclase and plagioclase.
- Orthoclase feldspar ( KAlSi 3 O 8 ) is a mineral commonly found in granite, a plutonic igneous rock.
- Cryptoperthite textures form when orthoclase ( a feldspar mineral containing both potassium and sodium cations ) is quenched very rapidly.
- Ostwald ripening is thought to occur in the formation of orthoclase megacrysts in granites as a consequence of subsolidus growth.
- Adjacent to the hotel the granite is coarse-grained with large phenocrysts of orthoclase, sometimes more than in length.
- They consist of quartz, plagioclase, orthoclase or alkali feldspar, rare mafics ( pyroxene ), and rare zircon.
- About 25 % of the volcanics contain crystal content, including plagioclase, hornblende, orthopyroxene, orthoclase and sporadic quartz.
- If a rock undergoes phyllic alteration, then orthoclase feldspar, biotite and various silicates are altered in addition to plagioclase.
- When a granitoid contains less than 10 % orthoclase, it is called tonalite; pyroxene and amphibole are common in tonalite.
- In the acid rocks the common feldspars are orthoclase, perthite, microcline, and oligoclase all having much silica and alkalis.
- While slowly cooling within the earth, sodium-rich albite lamellae form by exsolution, enriching the remaining orthoclase with potassium.
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