The big robot lurched off through the dense atmosphere and vanished through a segmented crystalline wall.

A network of caves exists here, wherein are crystalline walls of many colors and patterns of color.

They rose like stingers and stabbed the crystalline walls.

A slim hand shot out to an inconspicuous set of studs set into the crystalline wall.

She stopped, leaning against the outer, crystalline wall of the cave.

Everywhere the hailstones struck, tiny cracks appeared in the crystalline walls.

She wandered from his side and ran her palm over the crystalline wall.

I held my torch high, letting the light shatter on the crystalline walls.

Even their boots made no noise, for the crystalline walls and floors seemed to absorb all the sounds.

I set my teeth and reared my head back, reestablishing the crystalline wall.