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
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
09770930017272006164959.jpg
Biotite

Chão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
07159380017370595064204.jpg
Biotite, etc.

Regada, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
09770930017272006164959.jpg
Biotite

Chão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
07847070017369185718773.jpg
Biotite, etc.

Regada, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
09770930017272006164959.jpg
Biotite

Chão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde, Mangualde, Viseu, Portugal
Locality type:Pegmatite Field
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 Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
Data Identifiers
Mindat Occurrence Record ID:1011992
Long-form Identifier:1:3:1011992:7
GUID (UUID V4):0
Localities for Biotite in this Region
Chão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
Regada, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
Rochel, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
Nearest other occurrences of Biotite
1.1km (0.7 miles) ⓘChão do Castanheiro, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
1.2km (0.8 miles) ⓘRochel, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
4.0km (2.5 miles) ⓘRegada, Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
9.2km (5.7 miles) ⓘPicoto Mine, Vilar Seco, Nelas, Viseu, Portugal
14.0km (8.7 miles) ⓘVila Seca Mine, Vila Seca, Tavares (Chãs; Várzea e Travanca), Mangualde, Viseu, Portugal
16.9km (10.5 miles) ⓘVenturinha, Sezures, Penalva do Castelo, Viseu, Portugal
23.4km (14.5 miles) ⓘFonte Limeira quarry, U.F Romãs Decermilo e Vila Longa, Sátão, Viseu, Portugal
23.5km (14.6 miles) ⓘSeixos Alvos Mine, U.F Couto de Cima e Couto de Baixo, Viseu, Viseu, Portugal
26.8km (16.7 miles) ⓘBejanca Mine (Carvalhal do Estanho), Queirã, Vouzela, Viseu, Portugal
28.5km (17.7 miles) ⓘAssunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal
References
Recursos Minerais Metálicos, Jazigos Pegmatíticos, Departamento de Geologia da Faculdade de Ciências da Universidade de Lisboa, Lisboa, 2006.
 
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