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
Herdade do Ferragudo Mine, Castro Verde e Casével, Castro Verde, 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 Herdade do Ferragudo Mine, Castro Verde e Casével, Castro Verde, Beja, Portugal
Data Identifiers
Mindat Occurrence Record ID:1676830
Long-form Identifier:1:3:1676830:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
5.5km (3.4 miles) ⓘPorteirinhos Mine, Almodôvar e Graça dos Padrões, Almodôvar, Beja, Portugal
7.5km (4.7 miles) ⓘCerro do Algaré Mine, Almodôvar e Graça dos Padrões, Almodôvar, Beja, Portugal
10.1km (6.3 miles) ⓘBrancanes Mine, Brancanes, Almodôvar e Graça dos Padrões, Almodôvar, Beja, Portugal
18.5km (11.5 miles) ⓘBarrigão Mine, Santa Cruz, Almodôvar, Beja, Portugal
30.2km (18.8 miles) ⓘFerrarias e Castelo Mine, Santa Vitória e Mombeja, Beja, Beja, Portugal
54.3km (33.7 miles) ⓘLousal Mine, Azinheira dos Barros, Grândola, Setúbal, Portugal
58.0km (36.1 miles) ⓘPalmeira No. 2 quarry, Monchique, Monchique, Faro, Portugal
99.3km (61.7 miles) ⓘBarrocal quarries, Nossa Senhora da Tourega e Nossa Senhora de Guadalupe, Évora, Évora, Portugal
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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