Don’t let obsidian steal your heart!
While this is very unlikely in today’s culture, it was almost a certainty for those individuals sacrificed by the Aztecs during religious rituals. Probably the only consolation for someone who is about to have their heart ripped out is the knowledge that the knife would be sharp. Aztec ceremonial knives were composed of flint or obsidian blades, and it is the geological properties of these rocks that would have at least made your demise swift.
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