Abstract
The mass spectrometry studies of the gas released by calcite powders when heated to between room temperature and 500 °C show that neither the surface of crystalline calcite, limited by rhombohedral faces, nor the surface of ground calcite dissociates throughout the whole temperature range. However, when treated by carbon dioxide, the ground calcite surface releases a quantity of this gas equivalent to some 30 % of the calcium carbonate monolayer and at a tempera ture much lower than that of bulk decomposition.
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