It's a slate. I apologise if I have used the wrong terminology: a 'slate roofing tile'. Perhaps I should have said 'roofing slate'. It must be about 5 or so mm in thickness.
Slate roofing tile is different from a roof slate.. That aside , what finish do you want to the edges? a diamond disc will cut if you want a square cut edge.a pair of slate snips will cut and give you a riven edge..
Thats if you have a natural slate from regions other than Brazil or China
Thanks for all your interest, people.
I wish I had the courage to use a slate hammer, but it's got to be the tile cutter. This has a continuous rim and hopefully will do the job, assuming the thing still works. It's been in the shed for years! The finish isn't too important, to be honest.
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