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
Alijó spodumene pegmatite, São Mamede de Ribatua, Alijó, Vila Real, Portugal


Locality type:Pegmatite
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
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Alijó spodumene pegmatite, São Mamede de Ribatua, Alijó, Vila Real, Portugal
Data Identifiers
Mindat Occurrence Record ID:1638652
Long-form Identifier:1:3:1638652:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
20.9km (13.0 miles) ⓘSão Pedro das Águias Mine, U.F Távora e Pereiro, Tabuaço, Viseu, Portugal
30.1km (18.7 miles) ⓘNumão prospect, Numão, Vila Nova de Foz Côa, Guarda, Portugal
34.0km (21.1 miles) ⓘLamas de Olo pluton, Vila Marim, Vila Real, Vila Real, Portugal
41.6km (25.9 miles) ⓘMacedo de Cavaleiros Volcanic area, Bornes, Macedo de Cavaleiros, Bragança, Portugal
42.5km (26.4 miles) ⓘMonte de Entre-Portelas Mine (S. João Mine; Adoria Mine), Cerva e Limões, Ribeira de Pena, Vila Real, Portugal
46.2km (28.7 miles) ⓘSeixigal (Pereira de Selão), Vilas Boas, Vidago, Chaves, Vila Real, Portugal
46.3km (28.8 miles) ⓘRatoeira No. 1 quarry, U.F. Sequeiros e Gradiz, Aguiar da Beira, Guarda, Portugal
46.9km (29.2 miles) ⓘRatoeira quarry, U.F. Sequeiros e Gradiz, Aguiar da Beira, Guarda, Portugal
50.3km (31.3 miles) ⓘVigia Mine, U.F. Aguiar da Beira e Coruche, Aguiar da Beira, Guarda, Portugal
51.5km (32.0 miles) ⓘAssunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal
References
Garate-Olave, Idoia, Roda-Robles, Encarnación, Santos-Loyola, Nora, Martins, Tania, Lima, Alexandre, Errandonea-Martin, Jon (2024) Crystallization Sequence of the Spodumene-Rich Alijó Pegmatite (Northern Portugal) and Related Metasomatism on Its Host Rock. Minerals, 14 (7) doi:10.3390/min14070701
 
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