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Boulder Opal

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Formula:
SiO2 · nH2O
A variety of Precious Opal

A variety of Precious Opal found in Queensland, Australia, as cracks or coatings in and around ironstone/sandstone boulders.

Visit gemdat.org for gemological information about Boulder Opal.


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Chemical Properties of Boulder OpalHide

Formula:
SiO2 · nH2O

Synonyms of Boulder OpalHide

Other Language Names for Boulder OpalHide

Varieties of Boulder OpalHide

Yowah NutSmall rounded pebbles of sandstone impregnated with Precious Opal.
Originally reported from Yowah opal field, Queensland, Australia.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Precious Opal7 photos of Boulder Opal associated with Precious Opal on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Boulder OpalHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Jones, J.B. and E.R. Segnit (1971), The nature of opal. I Nomenclature and constituent phases. Journal of the Geological Society of Australia: 18: 57-68.
Anal. Chem. Acta (1994): 286: 107.
Lapis Extra No. 10, Opal (1996).

Internet Links for Boulder OpalHide

Localities for Boulder OpalHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Finch Co.
    • Paroo Shire
    • Quilpie Shire
    • Winton Shire
Dennis Tryon collection
Brazil
 
  • Pará
    • São Geraldo do Araguaia
Revista Brasileira de Geociências, vol.30
Canada
 
  • British Columbia
    • Vernon Mining Division
      • Vernon
Can.Rockhound v.3, no.1; Simandl, G. J., Hancock, K. D., Callaghan, B., Paradis, S., & Yorke-Hardy, R. (1997). Klinker Precious Opal Deposit, South Central British Columbia, Canada-Field Observations and Potential Deposit-Scale Controls. British Columbia Ministry of Energy and Mines, 321-327.
Mineral and/or Locality  
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