L 1: Crystal System

L2 Classes OF symmetry

L 3: HM Notation

L4: Projection Diagrams

L 5 Elements of X-ray crystallography

L 10 Clay Minerals

L 12 and L14 Pleochroism and Double refraction

L 13 and L 15 Extinction Angle and Birefringence

L 16 Twinning in Minerals