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Obsidian is a type of naturally-occurring glass formed as an extrusive igneous rock. It is produced when felsic lava erupted from a volcano cools rapidly through the glass transition temperature and freezes without sufficient time for crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where cooling of the lava is rapid. Because of the lack of crystal structure, obsidian blade edges can reach almost molecular thinness. However, it is also very brittle and can shatter relativly easily. Typically, it is coloured black.

[edit] Warhammer

In the Warhammer universe, obsidian is shown to have potent anti-magical properties. This is reflected in the weapons available to the Chaos Dwarfs. For example, the Obsidian Blade is capable of destroying a foe's magic items, and the Talisman of Obsidian is capable of protecting the bearer from magical effects. This trend has continued in recent editions with the inclusion of the Obsidian Lodestone and Obsidian Trinket.

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