302-pp4 - UNIVERSITY OF SOUTH ALABAMA GY 302:...

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GY 302: Crystallography & Mineralogy GY 302: Crystallography & Mineralogy UNIVERSITY OF SOUTH ALABAMA Lecture 4: Stereo Projections Lecture 4: Stereo Projections
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Last Time 1. Miller Indices 2. Point Groups (32 of them) 3. Hermann-Mauguin Class Symbols
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Miller Indices
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The Point Groups There are 32 possible combinations of symmetry operations (the Point Groups) Each crystal class will have crystal faces that define the symmetry of the class (the crystal forms)
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Example 1: Orthorhombic crystal Hermann-Mauguin Class Symbols Step 3: Mirror planes perpendicular to rotational axes are put in a denominator position relative to the rotational axes 2/m 2/m 2/m
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Today’s Agenda 1. Stereo Projections and the Wulff Net 2. Stereo projections of the Point Groups
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Stereo projections Consider an cubic form (100)
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Stereo projections Envision the cube suspended in a sphere
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Stereo projections Now pass a line that is perpendicular to each crystal face ( poles ) outward to intersect the sphere 001 001 010 010 001
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Stereo projections Now envision the equatorial cross section of the spherical projection.
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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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302-pp4 - UNIVERSITY OF SOUTH ALABAMA GY 302:...

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