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
Bejanca Mine (Carvalhal do Estanho), Queirã, Vouzela, Viseu, 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 Bejanca Mine (Carvalhal do Estanho), Queirã, Vouzela, Viseu, Portugal
Data Identifiers
Mindat Occurrence Record ID:221808
Long-form Identifier:1:3:221808:3
GUID (UUID V4):0
Nearest other occurrences of Quartz
2.0km (1.2 miles) ⓘBejanca e Bodiosa Mining Field, U.F Couto de Cima e Couto de Baixo, Viseu, Viseu, Portugal
4.2km (2.6 miles) ⓘCerdeirinha Mine, U.F Couto de Cima e Couto de Baixo, Viseu, Viseu, Portugal
4.4km (2.8 miles) ⓘCavadas Mine, Ventosa, Vouzela, Viseu, Portugal
5.0km (3.1 miles) ⓘCastelo Mining Field, Ventosa, Vouzela, Viseu, Portugal
5.6km (3.5 miles) ⓘSeixos Alvos Mine, U.F Couto de Cima e Couto de Baixo, Viseu, Viseu, Portugal
5.7km (3.5 miles) ⓘCantarinhos Mine, U.F Boa Aldeia， Farminhão e Torredeita, Viseu, Viseu, Portugal
6.9km (4.3 miles) ⓘRoutar Mine, U.F Boa Aldeia， Farminhão e Torredeita, Viseu, Viseu, Portugal
7.5km (4.7 miles) ⓘVale Dormir Mine, U.F Boa Aldeia， Farminhão e Torredeita, Viseu, Viseu, Portugal
8.1km (5.0 miles) ⓘPoço das Fragas Mine, Bordonhos, São Pedro do Sul, Viseu, Portugal
8.2km (5.1 miles) ⓘA Seara do Soito Mine, U.F Boa Aldeia， Farminhão e Torredeita, Viseu, Viseu, Portugal
References
Gomes, M. E. P. (2000) Stanniferous quartz veins and quartz veins with scheelite and cassiterite from the Rebordelo-Ervedosa-Agrochão Region, Northeastern Portugal: Mineralogical and geochemical characteristics. Cadernos Lab. Xeolóxico de Laxe Coruña. Vol. 25, pp. 243-244
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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