Now wouldn't you like some nice stone walls like this in your garden, or perhaps a slate floor or staircase?
The slate is generally about 700baht per square meter finished, but this is also quite often varnished aftwerwards if it is indoors, looks pretty damn good, the walls I have to admit I have no idea how much per square meter that would cost, but being Thailand probably pretty cheap.
So to find your Thai stonemason all you need to do is drive around till you find a pile of rocks or slate, these they buy by the cubic meter and use as their advertising sign outside generally where they live.
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Here you can see how thick the slate slabs are, these have to be made thinner, how the Thais do this is with a trowel and something about half a kilo in weight, ie a large file or something like that, the file is also used to trim edges and stuff like that, anyway they hold the slab vertical, rest the trowel sideways onto the slab where they know there is a weak point, and then they just tap the trowel with the file and now have 2 pieces of slate, they generally bring each piece down to about 1cm thickness, I have tried this hundreds of times and have never been able to do it, also the bit of the file where the handle should be doesn't have the handle on, this bit is pointed and used to score the thin slabs of granite so they can be broken into the shape they need to be in for laying.