Archaeologists are fond of it because of obsidian hydration---a relatively secure (and relatively low cost) way to date the period an obsidian tool was last flaked.
Sourcing obsidian--that is to say, discovering where the raw stone from a particular obsidian artifact came from--is typically conducted through trace element analysis.
Two subsequent refinements of obsidian hydration dating (OHD)-empirical rate dating and intrinsic rate dating-improved the method.
Recent experimental work has shown that the rate of hydration is significantly influenced by the amount of intrinsic water (0H-) contained within the unweathered obsidian.
The arrow indicates the decline in dated habitations, supporting a hypothesis of postcontact demographic decline.
The second step is to calculate the diffusion rate of the water into the glass.
I will be explaining why we should not give up on this dating process and why it could successfully produce chronometric dates, but it is important that we must first know the past before we move forward.
History In 1960 Irving Friedman and Robert Smith which based the idea the freshly broken obsidian starts collecting water which in time begins to produce a hydration layer.