Orthorhombic crystal system

In crystallography, the orthorhombic crystal system is one of the seven lattice point groups. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a rectangular base (a by b) and height (c), such that a, b, and c are distinct. All three bases intersect at 90° angles. The three lattice vectors remain mutually orthogonal.

Bravais lattices 1
Crystal classes 2
See also 3
References 4

Bravais lattices

There are four orthorhombic Bravais lattices: simple orthorhombic, body-centered orthorhombic, base-centered orthorhombic, and face-centered orthorhombic.

Orthorhombic Bravais lattices
Name	Primitive (P)	Body-centered (I)	Base-centered (A, B or C)	Face-centered (F)
Pearson symbol	oP	oI	oS	oF
Unit cell

Crystal classes

The orthorhombic crystal system class names, examples, Schönflies notation, Hermann-Mauguin notation, point groups, International Tables for Crystallography space group number,^[1] orbifold notation, type, and space groups are listed in the table below.

#	Point group					Type (Example)	Space groups
#	Name	Schön.	Intl	Orb.	Cox.	Type (Example)	Space groups
16-24	sphenoidal ^[2]	D₂	222	222	[2,2]⁺	enantiomorphic (epsomite)	P222, P222₁, P2₁2₁2, P2₁2₁2₁ C222₁, C222 F222 I222, I2₁2₁2₁
25-46	pyramidal ^[2]	C_2v	mm2	*22	[2]	polar (hemimorphite, bertrandite)	Pmm2, Pmc2₁, Pcc2, Pma2, Pca2₁, Pnc2, Pmn2₁, Pba2, Pna2₁, Pnn2 Cmm2, Cmc2₁, Ccc2 Amm2, Aem2, Ama2, Aea2 Fmm2, Fdd2 Imm2, Iba2, Ima2
47-74	bipyramidal ^[2]	D_2h	mmm	*222	[2,2]	centrosymmetric (olivine, aragonite, marcasite)	Pmmm, Pnnn, Pccm, Pban, Pmma, Pnna, Pmna, Pcca, Pbam, Pccn, Pbcm, Pnnm, Pmmn, Pbcn, Pbca, Pnma Cmcm, Cmca, Cmmm, Cccm, Cmme, Ccce Fmmm, Fddd Immm, Ibam, Ibca, Imma

References

Hurlbut, Cornelius S.; Klein, Cornelis (1985). Manual of Mineralogy (20th ed.). pp. 69 – 73.

^ Prince, E., ed. (2006). International Tables for Crystallography. International Union of Crystallography.
^ ^a ^b ^c "The 32 crystal classes". Retrieved 2009-07-08.

The 7 crystal systems

triclinic monoclinic orthorhombic tetragonal trigonal hexagonal cubic (isometric)

Categories

Crystallography

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Orthorhombic crystal system