Fiorite

Fiorite
General
CategoryMineraloid
FormulaSiO2·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.

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