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Igneous extrusive layer

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v50.14 · v0.47.05
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Igneous extrusive stone layers are formed from andesite, basalt, dacite, obsidian, and rhyolite. Of these five, andesite, dacite, and rhyolite are functionally identical, different only in appearance and name, basalt is like the other three with the caveat that it is magma-safe, and obsidian is... unique.

Igneous extrusive layers

Stone found in igneous extrusive layers

Stone appearing in both igneous intrusive and igneous extrusive layers

Gems found in igneous extrusive layers

Gems appearing in both igneous intrusive and igneous extrusive layers

* See also: stone found everywhere

In the Real World

In real world Geology, Igneous Extrusive stone is formed by lava solidifying above the surface, open to the air. This is the main point of difference from igneous intrusive stone, which solidifies below the surface. This distinction is not kept in Dwarf Fortress Geology, in which the difference is simply the name and the contents of the two types of stone.

V · T · E
Sedimentary
Igneous
Intrusive
Extrusive
Metamorphic
Ore
Economic
Other
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