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
Sierra de San Pedro, Cáceres, Cáceres, Extremadura, Spain


Locality type:Mountain Range
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 Sierra de San Pedro, Cáceres, Cáceres, Extremadura, Spain
Data Identifiers
Mindat Occurrence Record ID:1905682
Long-form Identifier:1:3:1905682:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
45.9km (28.5 miles) ⓘCevadais occurrence, Campo Maior, Portalegre, Portugal
67.1km (41.7 miles) ⓘCerro Queimado, União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal
67.6km (42.0 miles) ⓘSegura Mines (Segura mining field), União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal
76.9km (47.8 miles) ⓘD. João quarry (Herdade do Padre João), Monforte, Monforte, Portalegre, Portugal
86.6km (53.8 miles) ⓘCabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal
92.8km (57.6 miles) ⓘSierra de San Cristóbal, Logrosán, Cáceres, Extremadura, Spain
93.6km (58.1 miles) ⓘGranite outcrop, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
References
Jiménez-Millán, Juan; Nieto, F; Abad, Isabel (2007) Gobbinsite and garronite assemblage produced by the intrusion and alteration of subvolcanic bodies (External Zone, Betic Cordillera). Seminars of the Spanish Mineralogy Society 3: 104 (2007), Sociedad Española de Mineralogı́a.
 
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