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Arkosic sandstones contain high abundances of feldspar as well as quartz.
Thin section granites. Dark green to black greenish brown more rarely lighter green. In thin section the rock exhibits large plates of quartz intergrown with altered plagioclase and microcline feldspar. This means that biotite in standard thin sections rarely goes completely extinct. The rock contains many small fox brown biotite grains with zircon inclusions each surrounded by a pleochroic halo.
Ca na k 2 3 mg fe al 5 al si 8 o 22 oh f 2. In german the word became feldspat. This 10x magnification photograph is a thin section of an arkosic sandstone. The presence of these aluminous silicate minerals are commonly used as a means of initially classifying granites as s type.
Note that it is made of of rounded grains cemented together by a fine matrix of opaque minerals the red brown color of the rock suggests these opaques may be some sort of iron oxide mineral. Feldspar mineral group name from swedish names for field feldt or falt and spar spat in reference to the spar in tilled fields overlying granite. The mineralogy of this granite is relatively simple biotite quartz and two feldspars plagioclase and k feldspar. S type granites can also contain aluminium rich iron and magnesium rich biotites.
The microcline exhibits characteristic cross hatched twinning. The large pink carlsbad twinned k feldspar megacrysts dominate the thin section. Photomicrographs of these minerals in thin section from s type granites of the lachlan fold belt are shown in figure 2a and 2b. For the gf a target region enclosed by the red rectangle in fig.
Biotite metaluminous granite showing a close up of one crystal. C 1 a is elaborately chosen after repeatedly comparing the grain size distribution on the thin section and naked eye observation on the rock core sample using a hand lens. In section 2 5 the detailed thin section analysis is conducted on different regions of thin sections of the three granites.
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In section 2 5 the detailed thin section analysis is conducted on different regions of thin sections of the three granites. C 1 a is elaborately chosen after repeatedly comparing the grain size distribution on the thin section and naked eye observation on the rock core sample using a hand lens. Biotite metaluminous granite showing a close up of one crystal.
