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Opal from
Cisco, Grand Co., Utah, USA

Mineral Species
Formula:SiO2 · nH2O
Quality for species:not specified / average specimens
Validity:Believed Valid
References:UGMS Bull 117 Minerals and Mineral Localities of Utah
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Cisco, Grand Co., Utah, USA
Nearest other occurrences of Opal
122.0km (75.8 miles) A Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USA
209.2km (130.0 miles) B Marge Group, Maybell Mines, Maybell District, Moffat Co., Colorado, USA
210.3km (130.7 miles) C Gertrude (G-Pit), Maybell Mines, Maybell District, Moffat Co., Colorado, USA
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