| Fiorite | |
|---|---|
| General | |
| Category | Mineraloid |
| Formula (repeating unit) | SiO2·nH2O |
| Identification | |
| Crystal habit | Globular, botryoidal, or stalactic |
| Fracture | Conchoidal |
| Luster | Pearly |
Fiorite is a hydrated silica mineraloid, a form of opal, found in cavities in volcanic tuff. It is a globular, botryoidal, or stalactic concretionary form of opal. The mineraloid has a pearly lustre and forms botryoidal masses. Named after Santa Fiora, Italy, fiorite is used as a gemstone.[1]