Thin Section Description Of Granite
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By comparing the plane polarized light left and crossed polarizer right images we can see that there are three minerals in this granite.
Thin section description of granite. Damage produced during thin section grinding causes speckles of light in the biotite where the crystal lattice has been deformed. Biotite metaluminous granite showing a close up of one crystal. Grain size for both matrix and phenocrysts if you have them. Fluorapatite ilmenite and titanite are also present in minor amounts.
Examples of thin sections. Biotite brown grains in plain light and pinkish brown with crossed polars the brown color is due to a property called. Garnet also occurs as granular or irregular masses. Visible mineralogy making clear which occur as phenocrysts if you have them.
Nearly colorless pink light reddish brown. The large pink carlsbad twinned k feldspar megacrysts dominate the thin section. Quartz 1 thin section hfov 2mm xpl. This is a large grained 1 21mm light coloured rock with the largest phenocrysts being of a colourless mineral.
Garnets commonly occur as euhedral to subhedral dodecahedral 110 or trapezohedral 112 crystalss which in thin section yield six or eight sided cross sections. It is a porphyritic rock. Rocks minerals fossils biomineralization and building materials. Diabas mandelstein 25x botticino limestone 100x botticino limestone 400x.
The black mineral is smallest in grain size 1 5mm and has a vitreous lustre. Andesit 100x bentheimer sandstone 25x trias sandstone. Stone and rock thin sections. This means that biotite in standard thin sections rarely goes completely extinct.
These are photographs of a thin section of granite magnification 10x perhaps the most common igneous rock we encounter. Cut and polished surface of granite magnified 1 5. Granite coarse or medium grained intrusive igneous rock that is rich in quartz and feldspar. The mineralogy of this granite is relatively simple biotite quartz and two feldspars plagioclase and k feldspar.
If the feldspars are all white but your thin section shows that they are half alkali feldspar and half plagioclase call the rock a granite. It is the most common plutonic rock of the earth s crust forming by the cooling of magma silicate melt at depth.
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It is the most common plutonic rock of the earth s crust forming by the cooling of magma silicate melt at depth. If the feldspars are all white but your thin section shows that they are half alkali feldspar and half plagioclase call the rock a granite. The mineralogy of this granite is relatively simple biotite quartz and two feldspars plagioclase and k feldspar.
