Bowen's Reaction Series in Thin Sections

This was a homework for undergraduate Petrology course.

Bowen's Reaction Series

Left: Plain polarized light (PPL). Right: Cross polarized light (XPL).

March 1, 2016 – This is evidence of Bowen's reaction series. in a volcanic rock from Mount Shasta, California (thin Section I-31).

Augite (blue in XPL) is at the center of the crystal. Amphibole (green in PPL and XPL) is surrounding the augite. Biotite (darker green in PPL and XPL) is on the edge of the crystal. Click the pictures for full resolution.