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Table 3 EDS-based x-ray microanalyical results for component spectra shown in Fig. 8c

From: Rock varnish on architectural stone: microscopy and analysis of nanoscale manganese oxide deposits on the Smithsonian Castle, Washington, DC

Oxide Al-rich Mn-rich Plagioclase
SiO2 49.3 22.0 62.2
Al2O3 43.4 9.9 17.6
CaO    
MgO 2.9 2.0  
Fe2O b3   23.5 0.0
K2O    0.1
Na2O 4.4 1.8 10.4
MnOc   40.8 9.6
Oxygens 10 10 8
Cationsa    
Si 2.68 1.73 2.86
Al 2.78 0.92 0.96
Ca    
Mg 0.23 0.23  
Fe   1.39 0.00
K    0.01
Na 0.46 0.28 0.93
Mn   2.71 0.37
  1. Normalized 100 wt%
  2. aCations based upon number of oxygens
  3. bTotal iron expressed as Fe3+
  4. cTotal manganese expressed as Mn2+