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Rock varnish on the red sandstone of the Smithsonian’s Castle is associated with elevated Mn concentrations. Fragments of the garden gateposts have been sampled for detailed analysis, including portable x-ray fluorescence spectrometry, light microscopy, and scanning electron microscopy/x-ray microanalysis. The varnish discolors the red stone down to ~0.25 mm, and forms a discontinuous surface coating enriched in Mn relative to Fe

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