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Slate is metamorphosed mud which is also called "phyllite". Coticule is also metamorphosed mud but the chemistry was different while it was cooling and developed the garnet crystals which make that...

This is a neat website and I hope to some day visit the quarry. I do wonder about slate for honing razors though! It's just so darned soft and there's nothing in it like garnets that are in the...

Yes, thanks for the info! I'm eager to try a slate hone from Wales as I've never considered slate to be of honing quality. Slate is a metamorphic form of shale i.e. a little harder and very platy....