leucite वाक्य
उदाहरण वाक्य
मोबाइल
- They resemble leucite in their shape, but have not yet been proved to have its crystalline outlines.
- The former consist mainly of plagioclase, leucite and augite, while the latter contain olivine in addition.
- By far the greater number of the rocks which contain leucite are lavas of Tertiary or recent geological age.
- They are rich in leucite, but contain also some sanidine and often much nepheline with hauyne or nosean.
- The leucite-tephrites and leucite-basanites of Vesuvius and Somma are familiar examples of this class of rocks.
- The leucite-tephrites and leucite-basanites of Vesuvius and Somma are familiar examples of this class of rocks.
- Rocks that contain leucite or nepheline, either partly or a wholly replacing felspar, are not included in this table.
- The leucite tinguaites are usually pale grey or greenish in color and consist principally of nepheline, alkali feldspar and aegirine.
- The leucite is often present in two sets of crystals, both porphyritic and as an ingredient of the ground mass.
- Nepheline decreases in amount as leucite increases since the abundances of the two reflect the Na : K ratio of the rock.
- They are black or ashy-grey in color, often vesicular, and may contain many large grey phenocysts of leucite.
- Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.
- Other localities for this group are at Julianehaab in Greenland with sodalite-syenite; at their margins they contain pseudomorphs after leucite.
- "' Leucite "'is a twinned, giving rise to twin-lamellae and to striations on the faces.
- Although these never contain quartz, but feldspar is usually present, though there are certain groups of leucite lavas which are non-feldspathic.
- Occasionally minerals of the feldspathoid group, such as nepheline, sodalite and leucite, occur, and rocks of this kind are known as phonolitic trachytes.
- The rocks in which orthoclase ( " or sanidine " ) is present in considerable amount are leucite-trachytes, leucite-phonolites and leucitophvres.
- The rocks in which orthoclase ( " or sanidine " ) is present in considerable amount are leucite-trachytes, leucite-phonolites and leucitophvres.
- In some cases they may take other forms, such as nepheline, leucite, and muscovite, but in the great majority of instances they are found as feldspar.
- Leucite monchiquites are fine-grained dark rocks consisting of olivine, titaniferous augite and iron oxides, with a glassy ground mass in which small rounded crystals of leucite are scattered.
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