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Igneous extrusive layer

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Created when magma exits a volcano and cools above the Earth's surface.

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 except that it is magma-safe, and obsidian is... unique.

Igneous extrusive layers[edit]

Stone found in igneous extrusive layers[edit]

Stone appearing in both igneous intrusive and igneous extrusive layers[edit]

Gems found in igneous extrusive layers[edit]

Gems appearing in both igneous intrusive and igneous extrusive layers[edit]

* See also: stone found everywhere

In Real Life[edit]

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 kept in Dwarf Fortress geology, with extrusive being the top layer around volcanoes and never the bottom-most layer, while intrusive is always the bottom layer and never the top.

Sedimentary
Igneous
Intrusive
Extrusive
Metamorphic
Ore
Economic
Other