The feldspar has partly unmixed on the micro-scale to form a perthite, and the presence of the alternating alkali feldspar and titanomagnetite present.
32.
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.
33.
It reflects more strongly in the 7.1 to 7.5 ?m range, which indicates quartz or alkali feldspar is the major constituent.
34.
If an alkali feldspar grain with an intermediate composition cools slowly enough, K-rich and more Na-rich feldspar domains separate from one another.
35.
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.
36.
The early phase rhyolites contain alkali feldspar ( 49? % volume ), plagioclase containing sodium ( 14? % volume ) and quartz ( 36? % volume ).
37.
Nepheline is a feldspathoid, a solid-solution mineral, that does not coexist with quartz; rather, nepheline would react with quartz to produce alkali feldspar.
38.
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.
39.
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.
40.
"' 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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