Theme of the Day:

• Point Symmetry (continued)
• Combining Point and Translational Symmetry

Point Symmetry (continued)

• Mirror Planes
• Rotational Symmetry
• Center of Symmetry
• Rotoinversion
• Notation - See Table 2.1
• Example: Point Symmetry of a Wooden Block
• 10 2D Point Groups
• 32 Point Groups - combinations of Point Symmetry operations - See Table 2.2

Combining Point and Translational Symmetry

• Contact Goniometer
• Recognizing Mirrors vs. Rotations in minerals
• Glide Symmetry
• Screw Axis
• Examples: Tiling Plane & Fancy - Wallpapers