Schist In Thin Section

Tourmaline occurs as elongate to stubby prisms having hexagonal or triangular cross sections.

Schist in thin section. Rock with quartz garnet hornblende muscovite. The large black grain is the garnet the red elongate grains are mica flakes. Garnet mica schist in thin section.

The thin section illustrates the folded metasedimentary banding with fine grained quartz muscovite and chlorite. Garnet mica schist crossed polars. Archean aged schist from the great unconformity exposed at wind river canyon wy.

Large porphyroblasts of chloritoid exhibit greenish brown blue pleochroism blocky shapes and poor cleavage. Quartz is the only other major constituent. Schist comes from the ancient greek for split through latin and french.

Schist is formed by regional metamorphism and has schistose fabric it has coarse mineral grains and is fissile splitting into thin layers. Schist from the col de l iseran alps. This is a microscopic view of a garnet grain that has grown in schist.

The word schist is derived from the greek word schízein meaning to split which is a reference to the ease with which schists can be split along the plane in which the platy minerals lie. Fact sheet darwin wrote. Schist is a metamorphic rock that comes in almost infinite variety but its main characteristic is hinted at in its name.

Garnet mica schist plane polars. It is formed by dynamic metamorphism at high temperatures and high pressures that aligns the grains of mica hornblende and other flat or elongated minerals. Schist has medium to large flat sheet like grains in a preferred orientation nearby grains are roughly parallel.