KASOTA LIMESTONE WEATHERING Another Material Present


After conducting two spot scans on two elongated materials, the analysis are not precise enough to unambiguously iden- tify the material. The elemental EDS analysis may not be representative of the material because it may be analyzing the materials below it (Figure 10). This material may be illite or an external contaminant such as asbestos.


Figure 7: the crystal growth of crystals with varying environments of formation (Folk, 1974).


Figure 9: Elongated materials located, as indicated by the arrows. Size varies from 12 to 20 μm.


Current Restoration Efforts


Figure 8: Elemental distribution map revealing that Al, K, and Si fill in the Ca/Mg cavities


The property director of the cathedral is replacing over twenty slabs, while coating the exterior stone with a water- based water repellent called Natural


Figure 10: Associated peaks of one elongated material from figure 8. 30 TPG • Jan.Feb.Mar 2019 www.aipg.org


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