Quartz crystals make up 25 %, plagioclase 5 %, alkali feldspar 10 %, biotite 5-10 % which is altered to chlorite, epidote and leucoxene.
42.
The texture should not be confused with myrmekite or granophyre, in which quartz forms club-shaped, curved or vermiform threads intergrown with plagioclase feldspar and alkali feldspar, respectively.
43.
In this locality there is a considerable area of granite rich in red alkali feldspar, and passing, by diminution in the amount of its quartz, into quartz-syenites and syenites.
44.
Mineral assemblages in phonolite occurrences are usually abundant feldspathoids ( nepheline, sodalite, hauyne, leucite and analcite ) and alkali feldspar ( sanidine, anorthoclase or orthoclase ), and rare sodic plagioclase.
45.
Granite differs from granodiorite in that at least 35 % of the feldspar in granite is alkali feldspar as opposed to plagioclase; it is the potassium feldspar that gives many granites a distinctive pink color.
46.
Potassium-40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar, which in turn is a common component of granitic rocks, more abundant in alkali feldspar granite and syenites.
47.
Potassium-40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar, which in turn is a common component of granitic rocks, more abundant in alkali feldspar granite and syenites.
48.
:: * Alkali feldspar is a group of minerals in which the chemical composition of the mineral can range from KAlSi 3 O 8 to NaAlSi 3 O 8, this represents a complete solid solution.
49.
The alkali feldspars are most commonly in a series between potassium-rich orthoclase and sodium-rich albite; in the case of plagioclase, the most common series ranges from albite to calcium-rich anorthite.
50.
The typical range of phenocrysts in ignimbrites are biotite, quartz, sanidine or other alkali feldspar, occasionally hornblende, rarely pyroxene and in the case of phonolite tuffs, the feldspathoid minerals such as nepheline and leucite.
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