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[Areyar]

people can be alergic to ANYTHING. lol

To OP: yeah, in DF you can even build with rocksalt and it won't dissolve your aqueduct.

[LegoLord]

Rock salt is different than table salt.  It does dissolve, but not as easily.

[MuonDecay]

Still, flowing water through a trough of any water-soluble mineral should promptly dissolve it.

[LegoLord]

Promptly means immediately and quickly.  Anyway, there is a limit to how much of something can dissolve in a given amount of water.  This is why we can, in fact, have exposed ranges of rock salt; the small amount of rain can't dissolve the whole mountain.  And then, when it dries, the dissolved rock salt would be back.

[sproingie]

The Romans wouldn't have built the Masada ramp out of anything but the local rock.  The Dead Sea area is full of chalky clay and sandstone impregnated with chalk, but this isn't the solid chalk from the White Cliffs of Dover or anything.

Buildings have been made out of chalk, and while they're falling apart now, that's after hundreds of years.  So yes, chalk is doable.  I don't know about rings and mugs, but if anyone could pull it off, Dwarves could.

Talc on the other hand is crumbly stuff, totally useless for building.

[LegoLord]

Rock, at any size, does not snap like a twig, people!  It's harder to work into any shape than wood.  Rings should be doable.  you can make a ring outta wood, you can make a ring outta stone.

[sproingie]

Okay, rings perhaps.  Probably easier than other rock.  It'll certainly be fragile (girl I knew broke at least a half dozen jade rings) but it'll work.

Talc, I still think not.  My favorite is rock salt though.  A rock salt mug.  Mmm.

[MuonDecay]

Promptly means immediately and quickly.  Anyway, there is a limit to how much of something can dissolve in a given amount of water.  This is why we can, in fact, have exposed ranges of rock salt; the small amount of rain can't dissolve the whole mountain.  And then, when it dries, the dissolved rock salt would be back.

An aqueduct is like a river or stream flowing through a man-made channel. It would not last long, we're talking about thousands of gallons an hour in most buildings like that, and flowing fast, too.

[LegoLord]

But you said trough, which generally aren't used for moving water around.

[Areyar]

Chalk would have similar problems if the water is acidic even more so.
It's how dripping caves are created: limstone dissolves in water and is deposited elsewhere when the water evaporates or soluability of the water is altered by temperature, other dissolvates, etc.

[LegoLord]

Limestone doesn't dissolve the way table salt does.  If you have frequent rains on a mound of table salt and a mound of limestone, both of equal mass, the limestone will still be there after several years, possible hundreds.  The table salt quickly gets washed away.  This has a lot to do with the solubility equilibrium constants of the two substance, or the K_sp.  K_sp is a fairly complicated subject, though (we had to do a retake of that in my AP chemistry class).

[Areyar]

I know. Hence the similar, not identical problem.