Stone Type: Tosawihi opalite

Tosawihi opalite biface thinning flake

Tosawihi Opalite is a volcanic tuff that has been transformed by hydrothermal activity to a high quality chert. The Tosawihi (White Knife) Shoshone take their name from this stone. It mainly occurs in white colours, but pink and caramel varieties occur as well.  The stone fluoresces green under black light, and it responds well to heat-treatment.

Biface thinning flake, USA

Biface Thinning Flake