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Thanks! Yes - it does make a swishy sound when honing with some pressure as I find most hard hones do. It is almost noiseless when using little/no pressure. An almost finished blade just glides...

Purchased as a 'carpenters oilstone'.

Lapped it flat then progressed up to 5k grit sandpaper. Produces medium grey slurry - very smooth with a slightly shiny matt look.

Harder than Thuringian,...