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
Brancanes Mine, Brancanes, Almodôvar e Graça dos Padrões, Almodôvar, Beja, Portugal


Locality type:Mine
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 Brancanes Mine, Brancanes, Almodôvar e Graça dos Padrões, Almodôvar, Beja, Portugal
Data Identifiers
Mindat Occurrence Record ID:1676785
Long-form Identifier:1:3:1676785:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
3.4km (2.1 miles) ⓘCerro do Algaré Mine, Almodôvar e Graça dos Padrões, Almodôvar, Beja, Portugal
4.8km (3.0 miles) ⓘPorteirinhos Mine, Almodôvar e Graça dos Padrões, Almodôvar, Beja, Portugal
8.9km (5.5 miles) ⓘBarrigão Mine, Santa Cruz, Almodôvar, Beja, Portugal
10.1km (6.3 miles) ⓘHerdade do Ferragudo Mine, Castro Verde e Casével, Castro Verde, Beja, Portugal
38.0km (23.6 miles) ⓘFerrarias e Castelo Mine, Santa Vitória e Mombeja, Beja, Beja, Portugal
57.3km (35.6 miles) ⓘPalmeira No. 2 quarry, Monchique, Monchique, Faro, Portugal
64.4km (40.0 miles) ⓘLousal Mine, Azinheira dos Barros, Grândola, Setúbal, Portugal
99.8km (62.0 miles) ⓘMasa Valverde Mine (Valverde Mine), Beas, Huelva, Andalusia, Spain
References
Oliveira, Daniel P. S. de, Silva, Teresa P., Morais, Igor, Fernandes, João A. E. (2025) Chemical and Mineralogical Characterization of Waste from Abandoned Copper and Manganese Mines in the Iberian Pyrite Belt, Portugal: A First Step Towards the Waste-to-Value Recycling Process. Minerals, 15 (1). doi:10.3390/min15010058
 
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