idocrase

noun

ido·​crase ˈī-də-ˌkrās 

ˈi-,

-ˌkrāz

: a mineral that is a complex silicate especially of calcium, magnesium, iron, and aluminum

Word History

Etymology

French, from Greek eidos form + krasis mixture, from kerannynai to mix — more at crater

First Known Use

1804, in the meaning defined above