 As well as cryptocrystalline quartz, macrocrystalline quartz (both vein quartz and rock crystal) was a commonly used raw material around the globe.In North America, Central America, and other places around the world, such as Turkey and New Zealand, obsidian, or volcanic glass, was also a highly sought-after material for knapping and was widely traded.This is due to the quality of the stone, the razor sharpness of edges that can be created, and the fact that it fractures in highly predictable ways.