The walls were made entirely of yellow crystal the color of the sun.

A yellow crystal on the solar plexus has been known to do wonders, too.

Balls of yellow crystal set on posts lit the way.

It consists of small yellow cubic crystals which turn black when exposed to light.

Pieces of yellow crystal dropped out on to the roof like strange sweets.

The late sunlight was like yellow crystal, brilliant and clear.

He pulled out the yellow crystal, which glittered in the chandelier light.

Then he turned once again toward the sinking sun, following the beam of the yellow crystal.

"I suppose they've got those yellow crystals in their mouths, like all the rest."

Up until then, I thought they might be responsible for those yellow crystals, but they're not.