Quartz - sericite mylonite, Calamita, Elba

Concomitant thrusting and magmatism resulted in the development of ductile mylonites in the Calamita Schists, part of the contact aureole of the Late Miocene Porto Azzurro pluton. This mylonite is made up of stretched and recrystallized quartz layers, interlayered with thin sericite-rich levels. Sericite resulted from the crushing of contact-metamorphic minerals such as andalusite, cordierite, and K-feldspar.

Field of View: about 2 mm
Polarized light - crossed polars

Related paper: https://doi.org/10.1029/2019GC008270