The alteration mineralogy associated with acid sulphate waters was dominated by amorphous silica, quartz, kaolinite, pyrite, anatase, smectite and alunite, whereas around carbonate springs amorphous silica, ferrihydrite, amorphous iron silicates and quartz predominated.
Ummyndun tengd súra súlfat vatninu var myndlaus kísill, kvars, pýrít, anatas, smektít og alúnít. Í kringum ölkeldurnar fannst myndlaus kísill, ferrihýdríð, myndlaus járnsiliköt og kvars.