Table 8.

Reduction from 6mm to mm2

Space group of unstraincd crystal, order 12 per lattice point		If stressed so that y and z ∥ any two of X, Y, and Z			Space group of strained crystal, order 4 per lattice point
		Coordinates referred to axes of unstrained crystal
No.	Symbol	1st Subset	2d Subset	3d Subset	No.	Symbol
183	P6mm	(x, y, z)	($\overline{y}$,x-y, z)	(y-x,$\overline{x}$, z)	35	Cmm2
		(x,x-y, z)	($\overline{y}$, $\overline{x}$, z)	(y-x,y, z)
		($\overline{x}$, $\overline{y}$, z)	(y,y-x, z)	(x-y,x, z)
		($\overline{x}$,y—x, z)	(y, x, z)	(x-y,$\overline{y}$, z)
184	P6cc	(x, y, z)	($\overline{y}$,x-y, z)	(y-x,$\overline{x}$, z)	37	Ccc2
		(x,x-y,½+z)	($\overline{y}$, $\overline{x}$,½+z)	(y-x,y,½+z)
		($\overline{x}$, $\overline{y}$, z)	(y,y-x, z)	(x-y,x, z)
		($\overline{x}$,y—x,½+z)	(y, x,½+z)	(x-y,$\overline{y}$,½+z)
185	P63cm	(x, y, z)	($\overline{y}$,x-y, z)	(y-x,$\overline{x}$, z)	36	Cmc21
		(x,x-y,½+z)	($\overline{y}$, $\overline{x}$,½+z)	(y-x,y,½+z)
		($\overline{x}$, $\overline{y}$,½+z)	(y,y-x,½+z)	(x-y,x,½+z)
		($\overline{x}$,y—x, z)	(y, x, z)	(x-y,$\overline{y}$, z)
186	P63mc	(x, y, z)	($\overline{y}$,x-y, z)	(y-x,$\overline{x}$, z)	36	Cmc21
		(x,x—y, z)	($\overline{y}$, $\overline{x}$, z)	(y-x,y, z)
		($\overline{x}$, $\overline{y}$,½+z)	(y,y-x,½+z)	(x-y,x,½+z)
		($\overline{x}$,y—x,½+z)	(y, x,½+z)	(x-y,$\overline{y}$,½+z)