Greenstone pebble, No. 5, composite image

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

Composite image of section of greenstone pebble. Optical scan of polished section in on left, macrophotograph (in cross-polarized light) of part of thin section on right. Long dimension of composite photo 38mm.

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.

Triassic Orenuag basalt with evidence of low-grade metamorphism

                                  Click on image to enlarge.     Photo © Daniel R. Snyder
Orenaug basalt (from the Pomperaug basin in western Connecticut) that has undergone low-grade metamorphism. XPL. Imaged area 2mm x 3mm.