Chalcedony (FL orange SW)
San Jacinto River, southeastern Texas
A nice piece of weather worn petrified wood. This is wood that has been replaced by chalcedony, a cryptocrystalline quartz. It has spots that fluoresce orange under SW UV illumination.
3.9 x 0.9 x 0.8 inches
9.9 x 2.3 x 2.0 cm