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The presence of these aluminous silicate minerals are commonly used as a means of initially classifying granites as s type.
Thin section 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. Fluorapatite ilmenite and titanite are also present in minor amounts. In german the word became feldspat. 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 rock contains many small fox brown biotite grains with zircon inclusions each surrounded by a pleochroic halo. 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. The large pink carlsbad twinned k feldspar megacrysts dominate the thin section. S type granites can also contain aluminium rich iron and magnesium rich biotites.
In thin section the rock exhibits large plates of quartz intergrown with altered plagioclase and microcline feldspar. Damage produced during thin section grinding causes speckles of light in the biotite where the crystal lattice has been deformed. The microcline exhibits characteristic cross hatched twinning. For the gf a target region enclosed by the red rectangle in fig.
This means that biotite in standard thin sections rarely goes completely extinct. Photomicrographs of these minerals in thin section from s type granites of the lachlan fold belt are shown in figure 2a and 2b. This 10x magnification photograph is a thin section of an arkosic sandstone. Biotite metaluminous granite showing a close up of one crystal.
Orthoclase from greek for straight and fracture in reference to the cleavage angle which is 90. Dark green to black greenish brown more rarely lighter green. Arkosic sandstones contain high abundances of feldspar as well as quartz.
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Arkosic sandstones contain high abundances of feldspar as well as quartz. Dark green to black greenish brown more rarely lighter green. Orthoclase from greek for straight and fracture in reference to the cleavage angle which is 90.
