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Opal from
Ashio mine (Ashio copper mine), Ashio, Nikko City, Tochigi Prefecture, Japan


Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Ashio mine (Ashio copper mine), Ashio, Nikko City, Tochigi Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:1817690
Long-form Identifier:1:3:1817690:0
GUID (UUID V4):0
Nearest other occurrences of Opal
81.6km (50.7 miles) ⓘOkumanza Hot Spring, Kusatsu, Agatsuma District, Gunma Prefecture, Japan
References
Patchick, Paul F. (1959) Amazing Ashio. Gems & Minerals, (262) 14-18, 87.
 
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