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An online document, "The History of The Geological Society of Glasgow, 1858 - 1908" has an entry briefly mentioning the Water of Ayr hone-stone bed at Troon, in which it says that the the bed is...

It's a very interesting subject, and worthy of more input. Petrified wood has been used for honing purposes, I believe, so it's feasible - the minerals in the water replace all the organic matter in...

Teh composition of the Water of Ayr stone is a bit confusing - some sources quote it as being "claystone" - a sedimentary material, distinct from clayshale, and others as a form of shale that has...