Groutellite
Post J E, Heaney P J
American Mineralogist 89 (2004) 969-975
Neutron and synchrotron X-ray diffraction study of the structures
and dehydration behaviors of ramsdellite and "groutellite"
_database_code_amcsd 0003566
9.5155 2.8644 4.7061 90 90 90 Pnma
atom     x   y     z  Uiso
Mn   .1416 .25 .0407 .0393
O1   .9577 .25 .7819  .046
O2   .2791 .25  .342  .046