SEM micrographs of experimental samples. A: Rosettes of dypingite, covered with extracellular organic material, precipitated from groundwater in association with a biofilm of cyanobacteria. B: Rosette-like dypingite precipitated from Atlin wetland in the presence of cyanobacterial consortium. C: Slender prismatic crystals of nesquehonite precipitated from Atlin wetland water in the abiotic system. D: Dypingite rosettes on prismatic crystals of nesquehonite precipitated from wetland water with the addition of NaOH.