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
Casa Montero, Vicálvaro, Madrid, Community of Madrid, Spain


Locality type:Pit
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 Casa Montero, Vicálvaro, Madrid, Community of Madrid, Spain
Data Identifiers
Mindat Occurrence Record ID:958365
Long-form Identifier:1:3:958365:8
GUID (UUID V4):0
Nearest other occurrences of Opal
6.5km (4.0 miles) ⓘAlmodóvar Hill, Vicálvaro, Madrid, Community of Madrid, Spain
49.3km (30.6 miles) ⓘPeña Mojada Quarry (Los Alisos E Quarry; La Cabrera pluton), Valdemanco, Community of Madrid, Spain
49.6km (30.8 miles) ⓘLos Alisos W Quarry (La Cabrera pluton), Valdemanco, Community of Madrid, Spain
50.5km (31.4 miles) ⓘEl Madroñal Quarry (La Cabrera pluton), Valdemanco, Community of Madrid, Spain
51.3km (31.9 miles) ⓘIsabel Quarry (La Saludadora Quarry; La Cabrera pluton), Valdemanco, Community of Madrid, Spain
53.5km (33.3 miles) ⓘLa Cabrera pluton, La Cabrera, Community of Madrid, Spain
References
Bustillo, M. A. y Pérez, J. L. (2005). Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid). Geogaceta, 38, 243-246.
 
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