Dr. Bruce Railsback of the University of Georgia's Department of Geology provides this online Atlas of Speleothem Microfabrics. Here he presents petrographic or electron microscope images of most known microfabrics found in stalagmites, stalactites, flowstones, and other chemically precipitated cave deposits. Notes Railsback, "Variation in the mineralogy, shape, size, clarity, orientation, and...