Obsidian

From DwarfFortressWiki

Obsidian

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Uses
Swords Masonry Stone crafting Construction
Properties
Igneous extrusive layer Material value 3
Contains
Hematite Native gold Native copper Tetrahedrite Native aluminum Brimstone Realgar Orpiment Stibnite Rutile Hornblende Alunite Microline
Wikipedia article

Obsidian is produced by cooling magma and is typically present in large quantities on maps with magma. Magma men also drop an obsidian rock when killed. Goblin towers are made of obsidian and can be mined to produce large quantities of it.

Obsidian is the only stone that can be used to make swords at a craftsdwarf's workshop. The damage of an obsidian weapon is the same as for a steel weapon of the same quality.^{v0.23.130.23a}

Obsidian is the most valuable noneconomic stone, and also more valuable than flux.