Fiorite

[faɪəraɪt]

Definition

(n.) 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.

Inputed by Laura

Definition

n. a kind of siliceous incrustation found in the vicinity of volcanoes and hot springs.

Inputed by Gerard