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| The common (104) and( 100) cleavage surfaces of calcite were created as periodic 29 ¨¢ x 29 ¨¢ lattices with a surface spacing of 25 ¨¢. All atoms were constrained to their observed structural positions with the calcium ion maintained at its full ionic charge (+2) and the carbonate charge (-2) partitioned among carbon (0.919) and oxygen (-0.973). Since the passivant solutions are typically applied to the stone at fairly high pH's, the exposed calcite surface is expected to be dominated by Ca2+ and CO32- |
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