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[Danarca]

I've been searching the raws for 30 minutes now and I can't figure out where the melting point of obsidian is located..
The wiki don't have anything on this aspect actually, and forum search turns out nothing

So, what and where should I do to make obsidian magma-proof?

[Sinergistic]

I've been searching the raws for 30 minutes now and I can't figure out where the melting point of obsidian is located..
The wiki don't have anything on this aspect actually, and forum search turns out nothing

So, what and where should I do to make obsidian magma-proof?

Give it a melting point?

from.../raw/objects/matgloss_stone_layer.txt
[MATGLOSS_STONE:OBSIDIAN]
[NAME:obsidian][COLOR:0:7:1][TILE:177][LAVA][SHARP]
[IGNEOUS_EXTRUSIVE]
[MELTING_POINT:13600] - melting point of bauxite.
[VALUE:3]

[Danarca]

Ahh thanks a lot, none of the entries had any tags referring to melting point so Ididn't think it was in there
Thanks a lot

[LegoLord]

That makes no sense!  Obsidian is hardened magma!  It can't be magma-proof, because then magma would always be solid!? Right?!

   My brain huurtsss

[Jay]

That makes no sense!  Obsidian is hardened magma!  It can't be magma-proof, because then magma would always be solid!? Right?!

   My brain huurtsss

No, the hardened magma just can't be remelted BY the magma.
Granted, that raises the question of what hardened it in the first place...

[ChocoHearts]

Granted, that raises the question of what hardened it in the first place...

Water, duh.

[Jay]

Granted, that raises the question of what hardened it in the first place...

Water, duh.

Which would have to get down to a considerably low temperature in order to instantly harden several thousand degree magma.

[Sinergistic]

Granted, that raises the question of what hardened it in the first place...

Water, duh.

Which would have to get down to a considerably low temperature in order to instantly harden several thousand degree magma.

http://www.youtube.com/watch?v=X1L1msstolE

wat? Or where you talking about something else?

[Akigagak]

That would be awesome if that happened in DF.

[Jay]

http://www.youtube.com/watch?v=X1L1msstolE

If you didn't just randomly look for a video showing lava hitting water and then posting it without actually looking at it first, you'd notice that the lava DID NOT harden instantly as my post specifically stated.
My post also made reference to the fact that, because lava can remelt obsidian given time, this entire situation is broken to begin with.

[n9103]

I'm curious where you're seeing some requirement for magma having to harden instantly at all.

[Jay]

I'm curious where you're seeing some requirement for magma having to harden instantly at all.

I haven't dealt with it in a while, but last I checked, in DF, it hardens instantly.

[stoned funeral]

Granted, that raises the question of what hardened it in the first place...

Water, duh.

Which would have to get down to a considerably low temperature in order to instantly harden several thousand degree magma.

This makes no sense. magma only needs to be brought down to the freezing temperature of whatever rock it's made out of, which isnt a "considerably low temperature". Do you see rocks spontaneously melting into magma because the atmosphere isn't a "considerably low temperature"? Think about every rock you see lying around. What makes a difference in how fast magma cools and freezes is conductivity, not necessarily the temperature of the cooling agent. And when you say "that raises the question of what hardened it in the first place..." that's stupid. The natural state of magma at surface temperatures isn't liquid, magma at the surface will harden anyway given enough time.

[LegoLord]

While the magma only has to be at the freezing point of the rock it is made from, consider that the magma is extremely hot, and the water would have to have a very small average kinetic energy (heat) to be able to absorb enough heat for the magma to freeze instantly.

[stoned funeral]

You're right in saying that water would need to be cold enough, or there would need to be enough water, that the equilibrium temperature for the water and magma together would be below the freezing point for rock. My point is that once that requirement is met, how much colder the water is makes no difference in how fast the magma cools. You could dunk magma in water that's been cooled to absolute zero and magma would still cool at almost the same rate as it would in lukewarm water, i.e. not instantly. For that you need a higher conductivity, not lower starting temperature. Or at least that's what my common sense tells me, I'm no physics major.