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The black mineral is smallest in grain size 1 5mm and has a vitreous lustre.
Thin section description of granite. Biotite brown grains in plain light and pinkish brown with crossed polars the brown color is due to a property called. Diabas mandelstein 25x botticino limestone 100x botticino limestone 400x. Fluorapatite ilmenite and titanite are also present in minor amounts. Colorless purple rose red black yellow brown green blue orange etc.
Grain size for both matrix and phenocrysts if you have them. 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. Andesit 100x bentheimer sandstone 25x trias sandstone.
This is a large grained 1 21mm light coloured rock with the largest phenocrysts being of a colourless mineral. The large pink carlsbad twinned k feldspar megacrysts dominate the thin section. Cut and polished surface of granite magnified 1 5. This means that biotite in standard thin sections rarely goes completely extinct.
Nearly colorless pink light reddish brown. Biotite metaluminous granite showing a close up of one crystal. Visible mineralogy making clear which occur as phenocrysts if you have them. Garnets commonly occur as euhedral to subhedral dodecahedral 110 or trapezohedral 112 crystalss which in thin section yield six or eight sided cross sections.
Damage produced during thin section grinding causes speckles of light in the biotite where the crystal lattice has been deformed. Stone and rock thin sections. It is a porphyritic rock. By comparing the plane polarized light left and crossed polarizer right images we can see that there are three minerals in this granite.
These are photographs of a thin section of granite magnification 10x perhaps the most common igneous rock we encounter. Nearly colorless to a pale brown pink green. Examples of thin sections. The mineralogy of this granite is relatively simple biotite quartz and two feldspars plagioclase and k feldspar.
Click on the images to enlarge. Quartz 1 thin section hfov 2mm xpl.
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Quartz 1 thin section hfov 2mm xpl. Click on the images to enlarge. The mineralogy of this granite is relatively simple biotite quartz and two feldspars plagioclase and k feldspar.
