RELATIVE WEATHERABILITY OF CALCIUM-CONTAINING MINERALS

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Abstract
The percentage of calcium released from semi-weathered minerals by dilute sulfuric acid was used as an index of weatherability, resulting in a sequence of decreasing weatherability as follows: calcite and dolomite, bytownite, apatite, labradorite, oligoclase, diopside, augite, hornblende and grossularite. This order agrees with other published sequences, but mainly for minerals within structural groups. The relative position of structural groups along a weatherability scale varies with weathering conditions, resulting in a unique weatherability sequence for each set of conditions.