Pretty sure this is garnet schist based on the google rabbit hole I dove down? Thought it was pretty cool- found LOTS of enormous pieces on a Washington beach. : r/rockhounds
Garnet-mica schist: Mineral information, data and localities.
Spessartine Garnet in Mica Schist, Tanzania | Rock minerals, Rocks and minerals, Crystals minerals
Mud to garnet schist — regional metamorphism at work | Life in Plane Light
Stock photo of Garnet Schist, a metamorphic rock containing garnet minerals, from…. Available for sale on www.naturepl.com