Abstract
Microscopic study shows that Caen Stone varies in its petrographic structure between pellet-rich and bioclast-rich forms. The former is much more microporous than the latter, and tends to draw water into its structure if wetted. In historic usage, this has apparently led to more severe decay than is seen in the latter variety, which has generally displayed good durability. Examples of Caen Stone that survive on the exterior of medieval buildings have led to the material acquiring a good reputation, but less evident, poorer-quality medieval Caen Stone may also be found internally in remnant blocks, where surface decay was cut out for the insertion of new material in earlier episodes of repair. Both pellet-rich and bioclast-rich varieties are encountered in new stone available in the market, and are likely to be distinguishable in standard tests. The appended report on Caen Stone usage at the Palace of Westminster by Tim Yates which follows lends weight to this conclusion.
Published Version
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