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
Trout Creek Lycopsid Fossil Forest, Chaffee County, Colorado, USA


Locality type:Formation
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 Trout Creek Lycopsid Fossil Forest, Chaffee County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:1747034
Long-form Identifier:1:3:1747034:0
GUID (UUID V4):0
Nearest other occurrences of Opal
7.6km (4.7 miles) ⓘSouth Park salt works, Antero Junction, South Park, Park County, Colorado, USA
12.0km (7.5 miles) ⓘBuena Vista, Chaffee County, Colorado, USA
15.5km (9.6 miles) ⓘRuby Mountain, Nathrop, Chaffee County, Colorado, USA
16.1km (10.0 miles) ⓘBuffalo Peaks, Chaffee County, Colorado, USA
21.5km (13.3 miles) ⓘMount Princeton Hot Spring, Chalk Creek District, Chaffee County, Colorado, USA
22.2km (13.8 miles) ⓘHortense Hot Spring, Chalk Creek District, Chaffee County, Colorado, USA
25.9km (16.1 miles) ⓘLast Chance Mine (Lower Adit; Kramer Mine; Adit No. 1; Adit No. 2), Browns Canyon Mining District, Chaffee County, Colorado, USA
26.5km (16.4 miles) ⓘBlue Stone Deposit, Browns Canyon Mining District, Chaffee County, Colorado, USA
26.5km (16.5 miles) ⓘWhite King Deposit, Browns Canyon Mining District, Chaffee County, Colorado, USA
26.5km (16.5 miles) ⓘPuzzle mine, Poncha Springs, Browns Canyon Mining District, Chaffee County, Colorado, USA
References
Mustoe, George E. (2025) Mineralization of Fossil Wood with Macrocrystalline Quartz: A Microscopic Investigation. Minerals, 15 (3). doi:10.3390/min15030225
 
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