Granite In Thin Section

This means that biotite in standard thin sections rarely goes completely extinct.

Granite in thin section. Granite in thin section syenite is a coarse grained intrusive igneous rock with a general composition similar to that of granite but deficient in quartz i e. Biotite granite crossed polars. Several of the biotite grains include zircon.

The feldspar component of syenite is predominant. Fluorapatite ilmenite and titanite are also present in minor amounts. Within s type volcanics cordierite occurs in place of clinopyroxene.

Biotite brown grains in plain light and pinkish brown with crossed polars the brown color is due to a property called. These are photographs of a thin section of granite magnification 10x perhaps the most common igneous rock we encounter. Damage produced during thin section grinding causes speckles of light in the biotite where the crystal lattice has been deformed.

Granite in thin section thin section gigapans. The presence of these aluminous silicate minerals are commonly used as a means of initially classifying granites as s type. Some common rock types as seen under the microscope.

Biotite metaluminous granite showing a close up of one crystal. This biotite granite features biotite quartz note that most of it is about one order too thick which accounts for the yellowish color perthite microcline plag and muscovite. The large pink carlsbad twinned k feldspar megacrysts dominate the thin section.

Biotite granite plane polars. Granite plane polars granite crossed polars. These are photomicrographs very thin slices of rock seen in plane polarised light or between crossed polarisers when the colours seen are produced by interference of light.