302ass2 - GY 302: Crystallography and Mineralogy (2011)...

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GY 302: Crystallography and Mineralogy (2011) Assignment 2: Stereonet projections Your Task: One last session with crystallography and then we are done. I would like you to plot the faces of three model crystals (4, 75, 167) on three separate stereonets (Wulff nets). One of the models is an isometric crystal, one is tetragonal and one is orthorhombic. Here are the rules for plotting the crystals: To find the points 1) position the crystal with the c-axis up above the Wulff net. For tetragonal crystals, this is the longest axis. For orthorhombic crystals it is normally the shortest axis, but for the model that you will encounter this year, position the model with the A 2 axis up. For isometric crystals, all axes are the same length so it doesn’t matter which is up. 2) Any face that lies exactly 90 ° to the plane of the Wulff net (e.g., (100), (001)) will haves its pole plot on the great circle that delineates the stereonet. Any face exactly parallel to the plain of the paper (e.g., (001)) will have its pole plot at the exact center of the Wulff net.
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This note was uploaded on 02/05/2012 for the course GLY 302 taught by Professor Staff during the Spring '11 term at S. Alabama.

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302ass2 - GY 302: Crystallography and Mineralogy (2011)...

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