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Message: <blockquote data-quote="4play" data-source="post: 4284370" data-attributes="member: 7223"><p>It looks like sedimentary rock, which can be prone to  spalling and delamination.  A lot of sedimentary rock have salt deposits in the layers, and water will dissolve the salt, this can create pockets, and cracks which allow more water to collect and deteriorate the rock.   Mortar being too hard is a real thing too.</p></blockquote><p></p>