List the words or expressions the author uses to describe the pearl. "The last time Kino saw it."

(The last time Kino saw it.) He looked into its surface and it was gray and ulcerous. Evil faces peered from it into his eyes, and he saw the light of burning. And in the surface of the pearl he saw the frantic eyes of the man in the pool. And in the surface of the pearl he saw Coyotito lying in the little cave with the top of his head shot away. And the pearl was ugly; it was gray, like a malignant growth.