This picture is of pyrite crystals (reddish-yellow block shapes) with a white crystal growth on it. The images was taken Canon DSLR camera using a Anchor Optical Wide Field Stereo Microscope at 40 times magnification. The rock plate the crystals were found on is Waldron Shale from Bartholomew County, Indiana USA. It dates to the Silurian Period about 419 million years ago.
