mujtihad: an Islamic scholar who engages in ijtihad, the effort to derive rules of divine law from Muslim sacred texts
scholar: a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines
erythrite: a reddish mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form and used in coloring glass; usually found in veins bearing cobalt and arsenic