Comments of The Hundred-Year Crystal Catalogue

Geologist and professor Bent meets a young boy, Iris, who eats gemstones to survive, and the two begin traveling together. But Bent knows more about Iris than he lets on, and Iris has been targeted for his ability in the past and may be again. This story was fine as a slice of life, but not especially compelling to me.
Trigger warnings: genocide, kidnapping, trafficking, lying.

Bent, who gathers minerals as a sample for his research, goes to the Akkrum mines which have been closed for a long time. Then, he saw a young person inside it who suddenly collapsed. The boy's name was Iris. Using minerals as his food, the color of the boy's pupil glistens with rainbow colors.

It's adorable