Click on any of the seven buttons on the right side of the figure to operate one of the seven symmetry classes of the hexagonal crystal system on a face pole in stereographic projection.

A single 6-fold rotation axis or the improper 6-fold rotation axis can either build a respective class. Theese axes will be present in the other five classes together with mirror plane or 2-fold axis.  Axes and planes or axis and axis are related similar as in the tetragonal system.

A click on the circle will clear the figure and select a new face pole.

Exercises

1) What is the intersection angle of the 2-fold axis and the 6-fold axis in class 62?

2) How many 2-fold axes can be observed in class 6/mm?

3) If a mirror plane perpendicular to the 6-fold axis is added in class 6m what class will result?

Please send your comments.

Table of subjects.

Presentation
Chemistry	Analytical	Chromatography
		Elemental organic analysis
		Volumetric analysis, simulation
	Crystallography	3 fold screw axis
		4 fold inversion axis on tetrahedron
		5 fold rotation axis absent in crystallography
		Binary axis and reflection plane in stereographic projection
		Bravais lattices
		Conic sections under symmetry operators
		Converting from spherical coordinates to stereographic projection
		Crystal lattice and unit cell
		Determination of unit cell
		Elements of symmetry in action - animation
		Elements of symmetry in action - cube game
		Elements of symmetry in action - dodecahedron game
		Elements of symmetry in action - icosahedron game
		Elements of symmetry in action - octahedron game
		Elements of symmetry in action - tetrahedron game
		Ewald sphere and crystal measurements
		Extinctions
		Five classes in the cubic system
		Five classes in the rhombohedral system
		From tetrahedron to prism
		Gnomonic projection
		Improper symmetry axis
		Miller indices
		Miller indices - animation
		Miller indices - cube game
		Miller indices - octahedron game
		Miller indices - rhombic dodecahedron game
		Miller indices - tetrahedron game
		Mirror plane
		Orientations of the cube
		Plane symmetry groups
		Question on point group
		Rotation axis in octahedron and Werner compounds
		Rotation axis on tetrahedron and organic molecules
		Rotation of the parallel and stereographic projections of the cube
		Seven faces in stereographic projection
		Seven classes in the hexagonal system
		Seven classes in the tetragonal system
		Six elements of symmetry in seven orientations
		Spherical projection of the octahedron
		Stereographic projection
		Stereographic projection of six polyhedra in different orientations
		Straight line equations and symmetry elements
		Symmetry, 2 fold axis
		Symmetry, 2, 3 and 6 fold axis in benzene
		Symmetry, 3 fold axis in the cube
		Symmetry, 4 fold axis in the cube
		Symmetry, 4 fold axis in the unit cell of gold
		Symmetry elements and Miller indices game
		Symmetry elements and Miller indices game - octahedron
		Symmetry in art and in crystallography
		Three classes in the monoclinic system
		Three classes in the orthorhombic system
		Twin crystals
		Two classes in the triclinic system
		Unit cell in hexagonal net
	General	Butane conformations
		Density
		Electrochemical cell
		Ethane conformations
		Resources of chemical-ICT: water, health and symmetry
Solid and liquid gold