Checking topological indices for nia and pcu topological types and comparing them with those for the simplified CaCO3 polymorphs. 

  1. Be sure that you have the TTD collection (see Appendix 3 for details) on your computer and the path TTD in System/TOPOS Parameters/Paths is correct. You may find a frequently updating collection of .ttd files on the ToposPro official site. For the sources of the TTD collection see Appendix 4. All .ttd files have to be copied into the TTD subdirectory. The path to the TTD collection can be changed in System/TOPOS Parameters/Paths.

  2. Load the TTD collection as shown in the next figure. ToposPro automatically loads all the .ttd files from the TTD folder, so you may easily expand your library of topological types by copying new .ttd files into ToposPro directory.
    IMPORTANT: if you have copied a new .ttd file you must reload TTD collection to accept this file. Wait until the collection is loaded.

    The format of the .ttd files can be changed in new ToposPro versions. If the current TTD Collection does not fit the new ToposPromessage an error message will appear. You have to update your TTD Collection from the ToposPro website.

  3. Open the TTD collection content by Database/TTD Collection/Content command. In the upper list of the TTD Collection window you have all .ttd files loaded together with the number of records in the files and the ranges of internal identifiers of topological types. Select one or several .ttd names and press Create List button; in the list Topological Types you will get all topological types stored in the .ttd files selected. Select any topological type (you may simply type the name of the topological type to find it quickly in the list); you will have all the topological indices in the lower window. In the example below a TTD collection of 4 databases with 17814 topological types is loaded (the number of topological types change frequently with updates).

  4. Select TOPOS&RCSR .ttd file, create list and find the nia topological type as shown above. Compare all nia topological indices with the indices computed for aragonite and vaterite. What are the differences between aragonite and vaterite in this relation?

  5. Find the pcu topological type and compare it with calcite. Why does calcite have no antitype?

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