Phyllite In Thin Section

Unlike slate phyllite has a definite sheen.

Phyllite in thin section. Photographs of banded iron formation thin sections demonstrating the change in mode and coarseness moving towards the gabbro. The strong parallel alignment of the mica grains allows the rock to be easily split into sheets or slabs. It is composed mainly of flake shaped mica minerals in parallel alignment.

In thin section the microtexture is dominated by muscovite and quartz grains formed during low grade metamorphism and compositional bands that reflect the original sedimentary layering. Phyllite in thin section. Archean aged phyllite from ontario.

An examination of geological thin sections of the mineral phyllite using polarizing microscopy as well as providing information on component minerals can reveal a great deal about how the rock was formed. Chlorite rich phyllite crossed polars. Phyllite phyllite is a fine grained metamorphic rock formed by the recrystallization of fine grained parent sedimentary rocks such as mudstones or shales.

Chloritoid in a muscovite chlorite phyllite. Its interference colors commonly seem anomalously bright compared. Phyllite above as imaged through crossed.

Phyllite above illuminated with plane polarized light. Range in length from 5 mm to 10 cm. Chlorite rich phyllite plane polars.

It is primarily composed of quartz sericite mica and chlorite. Crossbedding preserved in phyllite. The term from the greek phyllos leaf a reference to its characteristic cleavage was first used by c.