Summary

Paul Ernst The Planetoid of Peril

At least it ought to be impossible. Rock is inorganic, inanimate. It simply couldn't have the spark of life in it. Harley had seen many strange creations, on many strange planets, but never had he seen inorganic mineral matter endowed with animation. Nor had anyone else.
Yet the thing looked as though made of stone. Of some peculiar, quartz-suffused granite—proving that the wan, white-haired man he had talked to in the sanitarium had not been mad at all, but only too terribly sane. The creature's very eyes had had a stony look. Its eyelids had rasped like stone curtains rubbing together.
Source: Gutenberg

Paul Ernst The Planetoid of Peril

He'd got within twenty feet of the irregular ball, and had adjusted his gravity regulator to enable him to leap to its top, when he stopped as abruptly as though he had been suddenly paralyzed. Over the two deep pits that resembled nostrils in the grotesque mask of a face he thought he had observed a quiver. The illusion had occurred in just the proper place for an eyelid. It was startling, to say the least.
"I'm getting imaginative," said Harley. He spoke aloud as a man tends to do when he is alone and uneasy. "I'd better get a tighter grip on my nerves, or—good God!"
Source: Gutenberg

Paul Ernst The Planetoid of Peril

A tremor ran through the entire mass of rock. And directly in front of Harley, less than twenty feet from where he stood, a sort of half-moon-shaped curtain of rock slid slowly up to reveal an enormous, staring eye.
Frozen with a terror such as he had never felt before in a life filled with adventure, scarce breathing, Harley glared at the monstrous spectacle transpiring before him. A hill was coming to life, A granite cliff was growing animate. It was impossible, but it was happening.
The half-moon curtains of rock that so eerily resembled eyelids, blinked heavily.
Source: Gutenberg

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