Teeming with garnets big and small, fresh and weathered, the Setters Schist is a muscovite schist metamorphosed from a pelitic protolith in (presumably) the Taconian orogeny. It also features staurolite, which is present in this sample, and kyanite, which isn't.

Sample collected in Sparks, MD.

Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro rig, as seen here:

gigamacro.com/gigapixel-macro-imaging-system /