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Unformatted text preview: GY 302: Crystallography and Mineralogy (2011) Assignment 1: Isometric and Hexagonal Crystallography Your Task: This lab assignment will introduce you to elements of symmetry in crystals and how to identify them. As this is the first lab dealing with crystallography, expect some initial difficulties in doing this. Be patient. You will improve as time goes on (I hope). Use the plastic models provided in the classroom for guides in identifying crystallographic axes (a, b, c), mirror planes, rotational axes etc.) In this lab, we will focus on the most symmetrical crystal systems; the isometric and hexagonal crystal systems. Select 1 wooden crystal models from each of these 4 groups and answer the following questions: 1) What is it's highest rotational symmetry? 2) How many mirror planes does it have? 3) How many 2 fold, 3 fold, 4 fold or 6 fold rotational axes does it have? 4) Does it have any rotoinversion axes? (3-fold and higher) 5) Does it have a center of inversion? 6) What is its point group? In addition, draw a stick diagram for each of the models in the spaces provided In total, I expect 4 answer sheets from you by the due date. Make sure that you indicate the number of the model you do in the space provided on the answer sheets. Use an L- prefix for the large models (ink stamp)....
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- Spring '11