Orthopyroxene In Thin Section

The rock illustrated in these images contains both clinopyroxene and orthopyroxene and the significantly higher cr 2 o 3 content of the clinopyroxene in this sample gives it a pale green colour in plane polarized light whereas the cr poor orthopyroxene is colourless a. Thin irregular and wavy lamellae common. Usually colourless gray pale green or pale brown darker colours associated with fe rich varieties titanaugite is more distinctly coloured from brown pink to violet.

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Pale colored with greenish to pinkish pleochroism.

Orthopyroxene in thin section. Parallel extinction in longitudinal sections pale pink to green pleochroism. Clinopyroxene xyz 2 o 6 optical properties. Ferrous iron and magnesium substitute freely since they.

Note the different extinction positions of the two phases. Thin irregular and wavy lamellae common. Parallel in longitudinal sections and symmetrical in basal sections.

A diagnostic feature of members of the pyroxene group is the 110 cleavage that. Low birefringence first order colors. Anhedral grains may fill the space between other grains.

Alex strekeisen i vetrini della mia fantasia. Orthopyroxene host with blebs of clinopyroxene in ppl left and xpl right. Euhedral crystals will be stubby prisms.

Approximatly 90º cleavage planes. Colour and pleochroism. Fe rich orthopyroxene is typically found in diorite syenite and granite.

Pure enstatite can be colorless higher fe contents correspond to darker colors. The most common pyroxenes can be represented as part of the chemical system casio 3 wollastonite a pyroxenoid mgsio 3 and fesio 3 ferrosilite. Approximatly 90º cleavage planes.

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