Figure 10. Cation percent plot for Kristineberg metamorphic minerals near the Einarsson Zone. Compositions were determined by electron microprobe analysis. At many VMS deposits metamorphosed to the amphibolite facies, cordierite and anthophyllite are present in the host rocks, due to the reaction of chlorite and quartz initially present in zones of hydrothermal alteration. At Kristineberg, however, anthophyllite is absent. We suggest that the cordierite at Kristineberg formed instead by the reaction of kaolinite and chlorite, with excess kaolinite being converted into andalusite. The presence of kaolinite, rather than sericite, is an indicator of strongly acidic fluids; it is a typical phase in high-level epithermal alteration systems. We suggest that the Einarsson Zone may owe its Cu-Au enrichment to such an epithermal overprint.