Barbertonite
Mills S J, Whitfield P S, Wilson S A, Woodhouse J N, Dipple G M,
Raudsepp M, Francis C A
American Mineralogist 96 (2011) 179-187
The crystal structure of stichtite, re-examination of barbertonite, and the
nature of polytypism in MgCr hydrotalcites
Note: Sample 92459, 2H1 polytype of stichtite
Locality: Barberton, South Africa
_database_code_amcsd 0018334
3.09646 3.09646 15.627 90 90 120 P6_3/mmc
atom   x    y     z  occ Biso
Mg     0    0     0  .81 1.62
Cr     0    0     0  .19 1.62
O1   1/3  2/3 .0589       1.7
H1   1/3  2/3 -.007       1.7
Wat2 .23 -.23   .25 .204  1.7
CO3  1/3  2/3   .25 .097  1.7
O3   1/3  2/3   .25 .291  1.7