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. 2001 May 1;98(10):5487–5490. doi: 10.1073/pnas.101085998

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Copyright © 2001, The National Academy of Sciences

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(A) The common [211] trigonal scalenohedral (dog-tooth) form of calcite features adjacent crystal faces with enantiomorphic surface structures [after Dana (12)]. The markedly acentric surface structures of both the (31) face (B) and the (211) face (C) consist of corner-linked chains of CaO₆ octahedra, cross-linked by planar CO₃ groups, which are seen almost on edge. The l-aspartic acid is observed to adsorb preferentially on the (31) face, whereas d-aspartic acid adsorbs preferentially on the (211) face.

Inline graphic — (A) The common [211] trigonal scalenohedral (dog-tooth) form of calcite features adjacent crystal faces with enantiomorphic surface structures [after Dana (12)]. The markedly acentric surface structures of both the (31) face (B) and the (211) face (C) consist of corner-linked chains of CaO₆ octahedra, cross-linked by planar CO₃ groups, which are seen almost on edge. The l-aspartic acid is observed to adsorb preferentially on the (31) face, whereas d-aspartic acid adsorbs preferentially on the (211) face.