Webster’s Revised Unabridged Dictionary · 1913
Ripidolite
Ri·pid′o·lite (rĭ·pĭd′ō·līt), n. [Gr. ῥιπίς. ῥιπίς. fan + -lite.] (Min.) A translucent mineral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; — called also clinochlore.