I touched it and withdrew my hand quickly for at the contact every nerve in my arm tingled as though a shock of frozen electricity had passed through it.
It was not cold as we know cold.

It was a chill force--the phrase I have used--frozen electricity--describes it better than anything else.
Stanton looked at me oddly.
"'So you felt it too,' he said.

'I was wondering whether I was developing hallucinations like Thora.

Notice, by the way, that the blocks beside it are quite warm beneath the sun.' "We examined the slab eagerly.

Its edges were cut as though by an engraver of jewels.