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Aragonite has deposited from waters discharged from Broadlands geothermal drillhole, Br6. Waters from the drillhole, in contrast with others from the geothermal field, are highly supersaturated with CaCO 3 and contain relatively high concentrations of Mg 2+ , Ca 2+ , Sr 2+ and HCO 3 ‐. The formation of aragonite instead of calcite results from the rapid precipitation rate and the stabilising effect of the Ba 2+ , Sr 2+ , and possibly Mg 2+ on the orthorhombic structure.
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P. R. L. Browne (1973) studied this question.
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