At over eight inches long and nearly one and a half pounds, this obsidian piece is the largest artifact in the Fenn Cache. All told, the 56 artifacts in the cache weigh about 18 pounds ...

It appears as a dark glassy rock that’s typically black, although it can take on hues of green ... artifacts crafted by Native Americans centuries, if not millennia, ago. Indeed, obsidian ...

Luckily for archaeologists, it is possible to determine the origin of the obsidian from which the artifact was made. This is possible because the magma (molten material) associated with each volcanic ...