Onyx Opal

Variety of
Opal
OpalSiO2 · nH2O

Where it forms, where it's found

1recorded occurrences
Source · OpenStreetMap

Literature, links & citation

Cite this entry

Entry last updated 

@misc{mineral2025,
  author    = {Mineral Index editorial board},
  title     = {Onyx Opal — Mineral Index},
  year      = {2025},
  url       = {https://mineralindex.org/minerals/onyx-opal-9806}
}