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Table 4 SEM-based x-ray microanalysis results for carbon coated rock varnish extracted from Mn-rich zones expressed as atomic per cent

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

Element O Na Mg Al Si Mn Fe Ca Mn/Fe
X-ray line Kα Kα Kα Kα Kα Lα Lα Kα
RV 1 65.8 1.9 1.3 1.2 3.9 22.5 3.2 0.4 7.0
RV 2 66.7 1.9 1.7 1.6 5.6 18.0 4.4 0.1 4.1
RV 3 65.7 1.5 1.0 2.4 6.5 14.1 8.9   1.6
RV 4 67.0 1.9 1.4 1.2 4.4 19.4 4.3 0.4 4.6
RV 5 67.0 1.9 1.4 1.4 5.8 18.1 4.0 0.4 4.5
RV 6 67.0 1.9 1.4 1.2 4.4 19.4 4.3 0.4 4.6
RV 7 68.4 1.3 1.0 0.8 3.3 17.7 6.6 0.8 2.7
RV 8 68.5 1.7 1.2 0.7 2.8 21.5 2.9 0.8 7.4
Average 67.0 1.8 1.3 1.3 4.6 18.8 4.8 0.5 4.5
St dev 1.0 0.2 0.2 0.5 1.2 2.4 1.8 0.2 1.8
Calc. Si = 0      0.0 25.6 1.3   20.2