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
Cerro Queimado, União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal


Locality type:Mining Area
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 Cerro Queimado, União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal
Data Identifiers
Mindat Occurrence Record ID:1615076
Long-form Identifier:1:3:1615076:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.3km (0.8 miles) ⓘSegura Mines (Segura mining field), União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal
26.5km (16.5 miles) ⓘGranite outcrop, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
37.0km (23.0 miles) ⓘSão Miguel de Acha Mines, São Miguel de Acha, Idanha-a-Nova, Castelo Branco, Portugal
67.1km (41.7 miles) ⓘSierra de San Pedro, Cáceres, Cáceres, Extremadura, Spain
83.4km (51.8 miles) ⓘCevadais occurrence, Campo Maior, Portalegre, Portugal
90.7km (56.4 miles) ⓘCabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal
92.3km (57.4 miles) ⓘD. João quarry (Herdade do Padre João), Monforte, Monforte, Portalegre, Portugal
References
Cathelineau, Michel, Boiron, Marie-Christine, Lecomte, Andreï, Martins, Ivo, Silva, Ícaro Dias da, Mateus, Antonio (2024) Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas. Minerals, 14 (3) doi:10.3390/min14030287
 
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