Click in one of the buttons on the right side of the figure to operate one of the three symmetry classes of the orthorhombic crystal system on a face pole in stereographic projection. Among the 32 point groups of symmetry elements in crystallography the roups  2m,  22 and 2/mm belong to the orthorhombic system.The first group has mirror plane containing a 2-fold axis. The class (or group) 22 has a couple of 2-fold axis. The third is arranged  with a mirror plane perpendicular to he 2-fold axis and another mirror plane containing this axis.

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

Exercise

1) At what angel one of the 2-fold axis intersects the other rotation axis in class 22?

2) At what angle the implicit 2-fold axis intersects the two announced rotation axis in class 22?

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