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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Tourmaline from
Bejanca Mine (Carvalhal do Estanho), Queirã, Vouzela, Viseu, Portugal


Locality type:Mine
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Bejanca Mine (Carvalhal do Estanho), Queirã, Vouzela, Viseu, Portugal
Data Identifiers
Mindat Occurrence Record ID:1349620
Long-form Identifier:1:3:1349620:7
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
20.6km (12.8 miles) ⓘRegoufe Mines, Covelo de Paivó, Arouca, Aveiro, Portugal
25.9km (16.1 miles) ⓘCastanheira, Albergaria da Serra, Cabreiros e Albergaria da Serra, Arouca, Aveiro, Portugal
26.7km (16.6 miles) ⓘRebentão Mine, Lagares do Estanho Mines, Queiriga, Vila Nova de Paiva, Viseu, Portugal
26.7km (16.6 miles) ⓘLagares Mining Field, Vila Nova de Paiva, Viseu, Portugal
26.8km (16.7 miles) ⓘCubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
34.0km (21.1 miles) ⓘCorvaceira quarry, Corvaceira, Tavares (Chãs; Várzea e Travanca), Mangualde, Viseu, Portugal
36.7km (22.8 miles) ⓘAssunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal
47.7km (29.6 miles) ⓘAlto dos Seixos No. 2 Mine, Melo e Nabais, Gouveia, Guarda, Portugal
49.9km (31.0 miles) ⓘSítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
62.5km (38.8 miles) ⓘVale de Pião Mine, Cadafaz e Colmeal, Góis, Coimbra, 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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