fiorite

from The Collaborative International Dictionary of English v.0.48

Fiorite \Fi"o*rite\, n. (Min.)
   A variety of opal occuring in the cavities of volcanic tufa,
   in smooth and shining globular and botryoidal masses, having
   a pearly luster; -- so called from Fiora, in Ischia.
   [1913 Webster]