Symmetry and stereonets
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Symmetry and stereonets. Point symmetry: 32 possible combinations Mirrors, rotation, center of symmetry, rotoinversion 6 crystal systems. 6 crystal systems C-axis has highest rotation or longest growth direction All axes have + and - ends. Stereonets . 3-D projection into 2-D. stereonets.

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  • 6 crystal systems

  • C-axis has highest rotation or longest growth direction

  • All axes have + and - ends


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Stereonets

  • 3-D projection into 2-D


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stereonets

  • Have on them

    • crystal axes

    • Crystal faces

    • Symmetry elements


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How to plot crystal faces

  • Orient block on stereonet

  • Faces in northern hemisphere are X’s

  • Faces in southern hemisphere are O’s

  • Plotting poles to faces (line perpendicular to the crystal face)

  • Faces in center are horizontal

  • Faces on edge are vertical

  • Faces in between are at an angle


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How to plot symmetry elements on stereonet

  • Mirror planes are solid lines

  • Dashed lines are axes of rotation with no mirror

  • Use symbols for rotations



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