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. Colorless purple rose red black yellow brown green blue orange etc. Nearly colorless to a pale brown pink green.

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Biotite metaluminous granite showing a close up of one crystal.

Thin section description of granite. Andesit 100x bentheimer sandstone 25x trias sandstone. By comparing the plane polarized light left and crossed polarizer right images we can see that there are three minerals in this granite. Rocks minerals fossils biomineralization and building materials. The black mineral is smallest in grain size 1 5mm and has a vitreous lustre.

Examples of thin sections. Damage produced during thin section grinding causes speckles of light in the biotite where the crystal lattice has been deformed. Granite coarse or medium grained intrusive igneous rock that is rich in quartz and feldspar. The large pink carlsbad twinned k feldspar megacrysts dominate the thin section.

Stone and rock thin sections. The mineralogy of this granite is relatively simple biotite quartz and two feldspars plagioclase and k feldspar. Quartz 1 thin section hfov 2mm xpl. Cut and polished surface of granite magnified 1 5.

It is the most common plutonic rock of the earth s crust forming by the cooling of magma silicate melt at depth. Garnet also occurs as granular or irregular masses. Diabas mandelstein 25x botticino limestone 100x botticino limestone 400x. Fluorapatite ilmenite and titanite are also present in minor amounts.

These are photographs of a thin section of granite magnification 10x perhaps the most common igneous rock we encounter. 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. Grain size for both matrix and phenocrysts if you have them.

This means that biotite in standard thin sections rarely goes completely extinct. Nearly colorless pink light reddish brown. Click on the images to enlarge. 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 a porphyritic rock. Visible mineralogy making clear which occur as phenocrysts if you have them.

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Visible mineralogy making clear which occur as phenocrysts if you have them. It is a porphyritic rock. 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.