Metagabbro with sericite and titanite

Click on image to enlarge.          Photo © Daniel R. Snyder

Diorite-gabbro altered to metagabbro. A grain of feldspar has been largely altered to sericite (large mass of fine-grained gray-brown material in center). Two green hornblende grains are at top center and right center. A brown grain of titanite is at bottom right, Mt. Prospect complex, Bantam, Connecticut. XPL. Imaged area 1.3mm x 2 mm.