His eyes were black volcanic glass set in ivory, binding mine.

Glass is good for holding heat anyway, especially if you're using something like volcanic glass.

They were ice blue, sharp as volcanic glass, colder than space.

Her eyes were like volcanic glass, suspicious but not unfriendly.

The major component is volcanic glass typically present in quantities over 50 wt%.

Other cultures used whatever was handy, like volcanic glass, to shave.

Iron shoes because the ground there is mostly volcanic glass.

At least once a week, some slaves were killed or maimed by falling volcanic glass.

Even now the volcanic glass can be found on the sides of the mountain.

She held a knife of volcanic glass, and her smile was the gate to the Underworld.