Obsidian glass, near Bend, Oregon

Whereabouts

I collected this in the mid-1990s while on vacation.  What I vividly recall is the razor-blade sharpness of the glass, and paying the price of blood for grabbing a piece.  I like the jet black color and the perfect conchoidal fracture features.

Age & Formation
1300 years B.P., the Big Obsidian Flow of the Newberry Volcano.
QTVR