Table 1.4.1.1

International
Tables for
Crystallography
Volume D
Physical properties of crystals
Edited by A. Authier

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International Tables for Crystallography (2006). Vol. D. ch. 1.4, p. 100

H. Küppers^a ^*

^a Institut für Geowissenshaften, Universität Kiel, Olshausenstrasse 40, D-24098 Kiel, Germany
Correspondence e-mail: kueppers@min.uni-kiel.de

Table 1.4.1.1 | top | pdf |
Shape of the quadric and symmetry restrictions

System	Quadric		No. of independent components	Nonzero components
System	Shape	Direction of principal axes	No. of independent components	Nonzero components
Triclinic	General ellipsoid or hyperboloid	No restrictions	6
Monoclinic		One axis parallel to twofold axis (b)	4
Orthorhombic		Parallel to crystallographic axes	3
Trigonal, tetragonal, hexagonal	Revolution ellipsoid or hyperboloid	c axis is revolution axis	2
Cubic, isotropic media	Sphere	Arbitrary, not defined	1