Article · Wikipedia archive · Last revised Jul 3, 2026

Fiorite

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.

Last revised
Jul 3, 2026
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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.1

See also

See also

References

References

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