Opal-CT

Where it forms, where it's found

77recorded occurrences

Source · OpenStreetMap

Varieties

LussatiteSiO₂·nH₂O
Variety
—

Group, growth & confusion

13 members

Literature, links & citation

Citations

1971Jones, J. B., Segnit, E. R. (1971) The nature of opal I. nomenclature and constituent phases. Journal of the Geological Society of Australia, 18 (1) 57-68 doi:10.1080/00167617108728743DOI: 10.1080/00167617108728743
1994Graetsch, H. (1994) Structural characteristics of opaline and microcrystalline silica minerals. in: Heaney, P.J., Gibbs, G.V., editors. Reviews in Mineralogy Volume 29 Silica - Physical behaviour, geochemistry and materials applications. Mineralogical Society of America, 209-232.
1994Elzea, J.M., Odom, I.E., Miles, W.J. (1994) Distinguishing well ordered opal-CT and opal-C from high temperature cristobalite by x-ray diffraction. Analytica Chimica Acta, 286 (1). 107-116 doi:10.1016/0003-2670(94)80182-7DOI: 10.1016/0003-2670(94)80182-7
2008Kostov, Rusian I. (2008) Orphic Lithica As A Source Of Late Antiquity Mineralogical Knowledge. Annual Of The University Of Mining And Geology “ST. Ivan Rilski”, 51 (1) 109-115
2008Day, R., Jones, B. (2008) Variations in Water Content in Opal-A and Opal-CT from Geyser Discharge Aprons. Journal of Sedimentary Research, 78 (4) 301-315 doi:10.2110/jsr.2008.030DOI: 10.2110/jsr.2008.030

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Opal-CT — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/opal-ct-32185},
  note      = {Accessed 2026-05-11}
}