AM_Birnessite
Formula:
Mn O2.75 Na.29 H3.7
Name:
Birnessite
Unit cell:
5.174 2.85 7.336 90.0 103.18 90.0 , V=105.33
Space group:
C12/M1 (12)
Post J E , Veblen D R , American Mineralogist , 75 (1990) p.477-489, Crystal structure determinations of synthetic sodium, magnesium and potassium, birnessite using TEM and the Rietveld method, sample is Na-birn