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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Quartz from
Valtreixal mine, Espinhosela, Bragança, Bragança, Portugal


Locality type:Mine
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Valtreixal mine, Espinhosela, Bragança, Bragança, Portugal
Data Identifiers
Mindat Occurrence Record ID:1651434
Long-form Identifier:1:3:1651434:6
GUID (UUID V4):0
Nearest other occurrences of Quartz
7.4km (4.6 miles) ⓘFrança Mines, França, Bragança, Bragança, Portugal
8.4km (5.2 miles) ⓘVale da Formiga Mine, França, Bragança, Bragança, Portugal
8.8km (5.5 miles) ⓘPortelo Mine, França, Bragança, Bragança, Portugal
9.7km (6.0 miles) ⓘCalabor mines, Calabor, Pedralba de la Praderia, Zamora, Castile and Leon, Spain
11.8km (7.3 miles) ⓘAlto da Caroceira Mine, Aveleda e Rio de Onor, Bragança, Bragança, Portugal
14.7km (9.1 miles) ⓘCabeço do Seixo ou Selvagem ou Samil Mine, Samil, Bragança, Bragança, Portugal
16.2km (10.1 miles) ⓘDeveza de Cima Mine, Samil, Bragança, Bragança, Portugal
19.2km (11.9 miles) ⓘBabe Mine, Babe, Bragança, Bragança, Portugal
20.7km (12.9 miles) ⓘLomba Grande Mine, Tuizelo, Vinhais, Bragança, Portugal
21.8km (13.6 miles) ⓘVila Meã Mine, São Julião de Palácios e Deilão, Bragança, Bragança, Portugal
References
Borrajo, Iñigo; Tornos, Fernando; Stein, Holly; Hanchar, John M. (2024) Geochronology and decoupling controls of Sn-(Ta-Li) and W-(Sn) mineralization in the Iberian Variscan Massif, Spain and Portugal. Ore Geology Reviews, 173. 106253 doi:10.1016/j.oregeorev.2024.106253
Mota, Alexandra; Sant’Ovaia, Helena; Fádon, Oscar; Noronha, Fernando (2026) The Geochemistry of Granites Associated with W-Sn Deposits of North and Central Portugal and Castilla-León in Spain. Minerals, 16 (8). doi:10.3390/min16080823
 
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