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[paladin225]

I'm playing in DF version 34.11  and embarked on a location with a volcano.  I was just wondering if, while carving out a magma channel... is it okay for part of it to be soil/loamy sand tunnel?   Will the magma burn through the sand walls and start pouring out of the mountain?

[Astrid]

As of currently it doesnt even burn through ice walls provided they have been constructed.
No idea how the Dwarfs manage that feat, anyhow....

Nope, wont burn though sand as of right now.

[Niddhoger]

Flowing magma will burn trees and logs in your stockpile alike, but will be stopped by a wooden wall/drawbridge.  A wooden floodgate would be incinerated though.... dwarven physics makes little since some (most) of the time. 

[Quietust]

Flowing magma ... will be stopped by a wooden wall/drawbridge.  A wooden floodgate would be incinerated though.

Not strictly true - a wooden floodgate will hold back magma indefinitely if it stays closed (it'll only catch fire once it's opened), and a wooden drawbridge will only hold back magma if it's against its outer edge (e.g. if it raises to the right, then lava flowing from the left onto the "center" of the bridge will very quickly burn it up).

[Blastbeard]

No idea how the Dwarfs manage that feat, anyhow....

Must be the beard grease they use in lieu of mortar. Forms a seal to keep the wall standing that keeps the heat out too.