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


Locality type:Mine
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Bejanca Mine (Carvalhal do Estanho), Queirã, Vouzela, Viseu, Portugal
Data Identifiers
Mindat Occurrence Record ID:221809
Long-form Identifier:1:3:221809:0
GUID (UUID V4):0
Nearest other occurrences of Muscovite
5.6km (3.5 miles) ⓘSeixos Alvos Mine, U.F Couto de Cima e Couto de Baixo, Viseu, Viseu, Portugal
10.0km (6.2 miles) ⓘSanta Luzia quarry, Campo, Viseu, Viseu, Portugal
20.3km (12.6 miles) ⓘPadrão Mine, Manhouce, São Pedro do Sul, Viseu, Portugal
20.6km (12.8 miles) ⓘRegoufe Mines, Covelo de Paivó, Arouca, Aveiro, Portugal
21.2km (13.2 miles) ⓘPicoto Mine, Vilar Seco, Nelas, Viseu, Portugal
24.1km (15.0 miles) ⓘUpper dumps, Alto das Quelhas do Gestoso Mine, Gestoso, Manhouce, São Pedro do Sul, Viseu, Portugal
24.5km (15.2 miles) ⓘRegada, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, 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
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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