The carbonation of Mg(OH)
2 by carbon dioxide in air was examined. Compound, chemical composition, and surface property of the calcareous deposit formed in tidal zone were investigated.
As a result of the carbonation of Mg(OH)
2, dypingite was formed. Inside of the calcareous deposits composed of rust and Mg(OH)
2 and dypingite. Outside of the calcareous deposits composed of aragonite and dypingite. Thus, it is considered dypingite in the calcareous deposit were formed from Mg(OH)
2.
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