A stream of water, pure as crystal, flowed along the path, from the summit to the base.
This crystal pallor or a flushed joy—in one of the two she was most beautiful.
It was built in a perfect oval, and lighted from a crystal dome above.
Where it says, you know, "And he showed me a pure river of water, clear as crystal."
He strained his ears to listen, but the crystal was pretty much sound-proof.
On all sides, like crystal ghosts, the Earthmen rose to their feet.
The sky was already a pale blue and of the clearness of crystal.
And light and pure as crystal the distant tolling of a bell rose from the plain.
"Go to the crystal tube in the laboratory beyond," he said at last.
That look was like the bite of acid that reveals the structure of crystal in metals.