Arithmetic crystal class

Arithmetic crystal classes

Other languages

Classes arithmétiques (Fr).

Definition

Three-dimensional arithmetic crystal classes.

Crystal systems	Crystal class
	Geometric	Arithmetic
		Number	Symbol
Triclinic	$1$	1	$1P$
	${\bar 1}$	2	${\bar 1}P$
Monoclinic	$2$	3	$2P$
	$m$	4	$2C$
		5	$mP$
	$2/m$	6	$mC$
		7	$2/m P$
		8	$2/m C$
Orthorhombic	$222$	9	$222 P$
		10	$222 C$
		11	$222 F$
		12	$222 I$
	$mm$	13	$mm2 P$
		14	$mm2 C$
		15	$2mmC$
			$(Amm2)$
		16	$mm2F$
		17	$mm2I$
	$mmm$	18	$mmmP$
		19	$mmmC$
		20	$mmmF$
		21	$mmmI$
Tetragonal	$4$	22	$4P$
		23	$4I$
	${\bar 4}$	24	${\bar 4}P$
		25	${\bar 4}I$
	$4/m$	26	$4/mP$
		27	$4/mI$
	$422$	28	$422P$
		29	$422I$
	$4mm$	30	$4mmP$
		31	$4mmI$
	${\bar 4}m$	32	${\bar 4}2mP$
		33	${\bar 4}m2P$
		34	${\bar 4}m2I$
		35	${\bar 4}2mI$
	$4/mmm$	36	$4/mmmP$
		37	$4/mmmI$
Trigonal	$3$	38	$3P$
		39	$3R$
	${\bar 3}$	40	${\bar 3}P$
		41	${\bar 3}R$
	$32$	42	$312P$
		43	$321P$
		44	$32R$
	$3m$	45	$3m1P$
		46	$31mP$
		47	$3mR$
	${\bar 3}m$	48	${\bar 3}1mP$
		49	${\bar 3}m1P$
		50	${\bar 3}mR$

See also

Section 8.2.3 of International Tables of Crystallography, Volume A
Sections 1.3.4 and 1.5.3 of International Tables of Crystallography, Volume B
Section 1.4 of International Tables of Crystallography, Volume C