When a newly broken piece of obsidian is buried in soil it begins to absorb water, forming a "hydration rind." Experts can use the thickness of this rind to roughly determine age, which in the ...

With Obsidian forming part of the cohort of studios and developers bought by Microsoft as part of its 2018 spending spree, there are some understandable questions around whether the RPG will be ...

At over eight inches long and nearly one and a half pounds, this obsidian piece is the largest ... "The Fenn Cache" and in slightly different form, on NOVA's America's Stone Age Explorers website.

Snowflake obsidian is a form of volcanic glass that features white or grayish “snowflake” shapes made of embedded cristobalite. These pretty patterns are not artificially added as a cheap ...