CrystalTutor is a set of seven stacks that illustrate some basic ideas of solid state structure and geometry. This demonstration stack includes segments which illustrate the style and content of the individual stacks. You are welcome to copy this stack and give it away. You may not copy this stack or protions thereof into any other program, or use the pictures or text in any context other than this stack. The autor has also created several other stacks, in the same style discribing Chiral centers, VESPER, Hexane ring conformations and several other introductory chemistry stacks. For more detail and ordering information contact. The stack is in Stuffit Deluxe format. Adamant Graphics, 83 Temple Bay, Winnipeg, MB, Canada, R3T 2V1 Mail address - burchil@ccm.umanitoba.ca