Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Opal from
Blue Bird Mine, Bull Hill, Cripple Creek Mining District, Teller County, Colorado, USA


Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Native Gold3
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Blue Bird Mine, Bull Hill, Cripple Creek Mining District, Teller County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:1433355
Long-form Identifier:1:3:1433355:2
GUID (UUID V4):0
Localities for Opal in this Region
Blue Bird Vein, Blue Bird Mine, Bull Hill, Cripple Creek Mining District, Teller County, Colorado, USA
Nearest other occurrences of Opal
0.4km (0.2 miles) ⓘOrpha May, Cripple Creek Mining District, Teller County, Colorado, USA
0.9km (0.6 miles) ⓘZenobia Mine, Cripple Creek Mining District, Teller County, Colorado, USA
17.1km (10.6 miles) ⓘRosa No. 1 trench, Mount Rosa, El Paso County, Colorado, USA
23.8km (14.8 miles) ⓘDivide, Teller County, Colorado, USA
24.3km (15.1 miles) ⓘBlack Cloud Mine, Teller County, Colorado, USA
35.5km (22.1 miles) ⓘOliver Saddle Prospect, Tallahassee Creek Mining District, Fremont County, Colorado, USA
37.0km (23.0 miles) ⓘBarbara Claims, Tallahassee Creek Mining District, Fremont County, Colorado, USA
41.9km (26.0 miles) ⓘSpikebuck Mine, McIntyre Hills Area, Fremont County, Colorado, USA
74.2km (46.1 miles) ⓘSouth Park salt works, Antero Junction, South Park, Park County, Colorado, USA
75.6km (47.0 miles) ⓘAmerican Flag Mine, Turret Mining District, Chaffee County, Colorado, USA
References
Lindgren, Waldemar, Ransome, Frederick Leslie (1906) Geology and gold deposits of the Cripple Creek district, Colorado. Professional Paper 54. US Geological Survey doi:10.3133/pp54 pp.372-373
 
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