>>12950172B-but it's perfect!
Obisdian was SOO fucking important in ancient mesoamerica. It was used in weapons, trade, tools, religious uses, jewelry,etc.
It was damn near as ubiquitous as polymers and plastics are now.
http://en.wikipedia.org/wiki/Obsidian_use_in_Mesoamerica There is NO other name that fits as well as obisdian does.