alkali feldspar वाक्य
उदाहरण वाक्य
मोबाइल
- Pericline twinning is a type of crystal twinning which show fine parallel twin laminae typically found in the alkali feldspars microcline.
- The leucite tinguaites are usually pale grey or greenish in color and consist principally of nepheline, alkali feldspar and aegirine.
- The essential components of aplites are quartz and alkali feldspar ( the latter usually orthoclase or microperthite ), microcline and albite.
- With the addition of alkali feldspar replacing or becoming more dominant than calcic plagioclase theralites grade into foidal syenite, including shonkinite.
- By definition, granite is an igneous rock with at least 20 % quartz and up to 65 % alkali feldspar by volume.
- Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.
- The intergrowth forms by exsolution due to cooling of a grain of alkali feldspar with a composition intermediate between K-feldspar and albite.
- If cooling is sufficiently slow, the alkali feldspar may exsolve to form separate grains with near-endmember albite and K-feldspar compositions.
- Take the alkali feldspar minerals for example, whose end members are albite, NaAlSi 3 O 8 and microcline, KAlSi 3 O 8.
- Within the lava dome rocks lie phenocrysts of amphibole, biotite, plagioclase, quartz, and titanite with some alkali feldspar in some domes.
- The feldspar has partly unmixed on the micro-scale to form a perthite, and the presence of the alternating alkali feldspar and titanomagnetite present.
- The same sense of movement is even more evident in the G�nis porphyroid, where pressure shadows have formed around the quartz and alkali feldspar phenocrysts.
- It reflects more strongly in the 7.1 to 7.5 ?m range, which indicates quartz or alkali feldspar is the major constituent.
- If an alkali feldspar grain with an intermediate composition cools slowly enough, K-rich and more Na-rich feldspar domains separate from one another.
- Potassium and sodium feldspars are not perfectly miscible in the melt at low temperatures, intermediate compositions of the alkali feldspars therefore occur only in higher temperatures environments.
- The early phase rhyolites contain alkali feldspar ( 49? % volume ), plagioclase containing sodium ( 14? % volume ) and quartz ( 36? % volume ).
- Nepheline is a feldspathoid, a solid-solution mineral, that does not coexist with quartz; rather, nepheline would react with quartz to produce alkali feldspar.
- Alkali feldspar granite is used as construction material in the form of dimension stones, and polished slabs or tiles for building facades, pavements, and kitchen countertops.
- For instance, a granite that is formed from melted sediments may have more alkali feldspar, whereas a granite derived from melted basalt may be richer in plagioclase feldspar.
- "' Graphic granite "'is a leucocratic granitic rock consisting of alkali feldspar with exsolved quartz typically forming a distinctive repetitive pattern sometimes resembling cuneiform writing.
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