Abstract
DURING small-scale experiments at the Fuel Research Station on the effect of treatment of boiler feed-water on the structure of boiler scales, several deposits were examined by X-ray diffraction. Most of the deposits contained calcium carbonate as calcite and calcium sulphate as anhydrite. In the deposit from one of the experimental boilers, the bulk of the carbonate, however, occurred as the rather unusual hexagonal form, µ-CaCO3 or vaterite. This overlay a thin band of calcite. It is believed that this is the first occasion on which µ-CaCO3 has been reported in such deposits.
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