riven patio stone

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I'm in the US and have a question about British "riven" patio stone, what we call "natural cleft" stone. When you go to a stone-yard to buy it, was it sawn by the quarry so that it has a perfectly straight edge, leaving the customer to fabricate a natural edge?
 
They're generally sold as 'utility slabs' with limited decorative function. I quite like them so built my rear patio with them, but remember the builder's yard telling me that they are really just for laying sheds on or for areas with lots of foot traffic.

There are lots of other types of slabs with 'natural' edges however, which are not straight and more 'chipped' in various shapes.
 
We get "Indian Sandstone" that has a riven face and edges, but a milled back. Some of those have a distinct curve to them that has to be allowed for when placing them next to each other.
 
We get "Indian Sandstone" that has a riven face and edges, but a milled back. Some of those have a distinct curve to them that has to be allowed for when placing them next to each other.
That's more than we get here. We get a sawn edge, so that even the stone with a natural surface, when installed, looks like floor tile at the joints, unless many hours are spent beforehand "fettling" the edges with a pitching chisel or mallet.
 
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