It looks like a rhombehedral data set with small deviations from the
exact H3 symmetry to give the weak spots.
The standard H3 setting has origins at (0,0,0) (1/3, 2/3, 2/3) and
(2/3,1/3,1/3) so to get your translation vector to match the
conventional H3 one, you will have to reindex the P321
You may well have a rhombohedral obverse/reverse twin. See Acta
Cryst. B58 (2002) 477-481.
George
On Tue, Jun 14, 2011 at 03:07:40PM -0400, Edward A. Berry wrote:
> I'm currently struggling with what I think is a variation on this theme,
> would appreciate comments as to whether my thinking is re
