I risked a question as the horses picked their way over the slippery stones of the wet courtyard.

He grasped at the slippery stone of the balustrade and then lurched forward.

No clumps of weeds or slippery stone seemed too small for him to balance on.

Something dropped with a click on the slippery stones of the alley.

He had been dreading the return across those slippery stones.

More faces appeared, shouting and cursing as they struggled onto the slippery stones.

They ran, careless of the footing, and crossed the river on slippery stones.

The heat soon passed and there were a few miles of stumbling over smooth, slippery stones.

"I mean, besides a kind of hard, slippery stone?"

His right boot hit a slippery stone and he fell, striking his face on another rock.