Moss Opal
A variety of Opal
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About Moss Opal
Opal with dendritic inclusions, usually green silicates.
Visit gemdat.org for gemological information about Moss Opal.
Visit gemdat.org for gemological information about Moss Opal.Unique Identifiers
Mindat ID:
9799 (as Moss Opal)
3004 (as Opal)
3004 (as Opal)
Long-form identifier:
mindat:1:1:9799:0 (as Moss Opal)
mindat:1:1:3004:1 (as Opal)
mindat:1:1:3004:1 (as Opal)
Common Associates
Associations Based on Photo Data:
| 5 photos of Moss Opal associated with 'Chalcedony' | SiO2 |
| 3 photos of Moss Opal associated with 'Opal-AN' | SiO2 · nH2O |
| 2 photos of Moss Opal associated with 'Dendritic Agate' | SiO2 |
| 2 photos of Moss Opal associated with Magnesio-riebeckite | ◻Na2(Mg3Fe3+2)(Si8O22)(OH)2 |
| 1 photo of Moss Opal associated with Quartz | SiO2 |
| 1 photo of Moss Opal associated with 'Agate' | SiO2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Moss Opal
mindat.org URL:
https://www.mindat.org/min-9799.html
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References for Moss Opal
Reference List:
Localities for Moss Opal
Showing 22 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| Fetherston et al. (2013) |
Austria | |
| Exel (1993) |
Cuba | |
Kazakhstan | |
| Абдуллин et al. (2013) |
| Абдуллин et al. (2013) | |
| Gems of Kazakhstan et al. (in Rus.) |
Slovakia | |
| Koděra et al. (1986) |
| |
Spain | |
| Calvo Rebollar (2016) |
| Calvo Rebollar (2016) | |
USA | |
| - (2005) |
| Murdoch (1966) |
| Stoddard (1923) +1 other reference |
| Matthew Stanley Collection |
| Eckel et al. (1997) |
| Ransom (1974) |
| Ransom (1974) | |
| Ransom (1974) | |
| Ransom (1974) |
| MacFall (1975) |
| The Mineralogist |
| Extra Lapis - English No. 10 Opal |
Chrysoprase and Moss Opal deposits, River Pines, Fiddletown Mining District, Amador County, California, USA