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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Biotite from
Regada, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal


07159380017370595064204.jpg
Biotite, etc.

Regada, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
07159380017370595064204.jpg
Biotite, etc.

Regada, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
07847070017369185718773.jpg
Biotite, etc.

Regada, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
Locality type:Shaft
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Spessartine5
- var Brandãosite5
Autunite2
Feldspar Group2
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Regada, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
Data Identifiers
Mindat Occurrence Record ID:353070
Long-form Identifier:1:3:353070:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.0km (2.5 miles) ⓘCubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
4.4km (2.7 miles) ⓘChão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
4.4km (2.7 miles) ⓘRochel, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
10.3km (6.4 miles) ⓘPicoto Mine, Vilar Seco, Nelas, Viseu, Portugal
13.6km (8.5 miles) ⓘVila Seca Mine, Vila Seca, Tavares (Chãs; Várzea e Travanca), Mangualde, Viseu, Portugal
14.2km (8.8 miles) ⓘVenturinha, Sezures, Penalva do Castelo, Viseu, Portugal
20.5km (12.7 miles) ⓘFonte Limeira quarry, U.F Romãs Decermilo e Vila Longa, Sátão, Viseu, Portugal
21.8km (13.6 miles) ⓘSeixos Alvos Mine, U.F Couto de Cima e Couto de Baixo, Viseu, Viseu, Portugal
24.5km (15.2 miles) ⓘBejanca Mine (Carvalhal do Estanho), Queirã, Vouzela, Viseu, Portugal
25.2km (15.6 miles) ⓘAssunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal
References
Martins da Pedra collection
Mineralien Atlas
 
and/or  
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