Fiorite

Fiorite
General
CategoryMineraloid
Formula
(repeating unit)
SiO2·nH2O
Identification
Crystal habitGlobular, botryoidal, or stalactic
FractureConchoidal
LusterPearly

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]

  1. ^ Manutchehr-Danai, Mohsen (2000). Dictionary of Gems and Gemology. Springer-Verlag. p. 182. ISBN 978-3540674825.