"A. Demant, P. Munch, N. Romeuf, D. Morata" Chapter 34. Distribution and chemistry of secondary minerals (zeolites and clay minerals) from Hole 917A, southeast Greenland Margin" 152SR-231 173 174 184 192 SiO2 0.32 0.26 0.29 0.31 Al2O3 1.72 1.57 1.5 1.69 FeO 51.83 50.61 49.16 49.21 Fe2O3 15.2 20.32 22.85 21.52 MnO 0.5 0.37 0.41 0.83 MgO 1.52 0.99 1.2 0.97 TiO2 26.13 23.63 22.45 22.75 Cr2O3 0.04 0.02 Total 96.93 97.51 97.57 96.97 Structural formulae with 32 oxygens Si 0.098 0.08 0.087 0.094 Al 0.609 0.56 0.533 0.604 Fe2+ 13.061 12.786 12.409 12.494 Fe3+ 3.446 4.62 5.188 4.915 Mn 0.128 0.095 0.104 0.213 Mg 0.681 0.445 0.539 0.439 Ti 5.919 5.368 5.096 5.194 Cr 0.008 0.006 Sum 23.951 23.96 23.956 23.953 Usp(a) 76.19 68.82 64.79 66.45 Usp(c) 78.59 70.94 67.62 69.19