idiochromatic
/ˌɪdɪə(ʊ)krə(ʊ)ˈmatɪk/Mineralogy
adjective
Of a mineral: deriving its colour or optical properties from the chemicals which are an essential part of its composition.
Origin
Mid 19th century; earliest use found in James Nicol (1810–1879), geologist. From idio- + chromatic, after German idiochromatisch.