Igneous Rocks Thin Section

Rocks under the microscope.

Igneous rocks thin section. Petrography the branch of geology dealing with the description and systematic classification of rocks especially by microscopic examination of thin sections petrography is a subfield of petrology. Granodiorite ˌ ɡ r æ n oʊ ˈ d aɪ ə r aɪ t n ə is a phaneritic textured intrusive igneous rock similar to granite but containing more plagioclase feldspar than orthoclase feldspar according to the qapf diagram granodiorite has a greater than 20 quartz by volume and between 65 to 90. Birefringence and color.

This means that biotite in standard thin sections rarely goes completely extinct. Damage produced during thin section grinding causes speckles of light in the biotite where the crystal lattice has been deformed. Mar 24 2014 igneous rocks and minerals in thin section.

In general epidote in igneous rocks has rather high fe 3 content which may color it pale yellow green. Petrology the branch of geology dealing with the origin occurrence structure and history of rocks. Some common rock types as seen under the microscope.

See more ideas about rocks and minerals igneous igneous rock. In this course most of the lecture material falls under the field.