Obsidian Mirror
The small black circle in the photo the photograph above is actually what many archaeologists believe to be a mirror made out of obsidian. This was achieved by smoothing the volcanic rock down until it was shiny enough that you were able to see some form of a reflection.
Works Cited
Picture: https://www.courses.psu.edu/art_h/art_h201_ejw3/catal.html
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