idiochromatic

[ id-ee-uh-kroh-mat-ik, -oh-kruh- ]
/ ˌɪd i ə kroʊˈmæt ɪk, -oʊ krə- /

adjective

(of a mineral) deriving a characteristic color from its capacity to absorb certain light rays.
Compare allochromatic.

Origin of idiochromatic