Zn concentration and isotope chart and hydrozincite photomicrograph

A) Concentration and Zn isotope signature of water in the Rio Naracauli as a function of distance downstream. As hydrozincite precipitates, favoring the heavier isotope of Zn, both the Zn concentration (open symbols) and the value of δ⁶⁶Zn (solid symbols) decrease. B) Photomicrograph of hydrozincite forming on the surface of bacterial exopolysaccharide secretions.