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
South Table Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA


Locality type:Mountain
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 South Table Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:136915
Long-form Identifier:1:3:136915:1
GUID (UUID V4):0
Nearest other occurrences of Opal
3.7km (2.3 miles) ⓘNorth Table Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
5.3km (3.3 miles) ⓘGreen Mountain, Golden, Golden Mining District, Jefferson County, Colorado, USA
28.7km (17.8 miles) ⓘJewelry Shop Mine (West Gold Mine; Sylvanite Mine), Lamartine Mining District, Clear Creek County, Colorado, USA
31.0km (19.3 miles) ⓘColumbia, Lamartine Mining District, Clear Creek County, Colorado, USA
33.7km (20.9 miles) ⓘBlack Hawk No. 1 vein, Boulder County Tungsten Mining District, Boulder County, Colorado, USA
36.0km (22.3 miles) ⓘClyde Mine (Lily Mine; Gale Mine; Hoosier; Western Star), Boulder County, Colorado, USA
51.4km (31.9 miles) ⓘCastle Rock, Castle Rock Area, Douglas County, Colorado, USA
61.1km (37.9 miles) ⓘRed Jacket (Star of the West; Star of the West No. 2; Mohawk; Iowa), Montezuma Area, Summit County, Colorado, USA
84.2km (52.3 miles) ⓘHot Sulfur Springs, Grand County, Colorado, USA
90.8km (56.5 miles) ⓘDivide, Teller County, Colorado, USA
References
Wilson, Wendell E. (1988) Notes From the Editor - Minerals of Cornwall. The Mineralogical Record, 19 (3) 138-207pp.153-153
 
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