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
Los Santos W deposit, Los Santos, Salamanca, Castile and Leon, Spain


Locality type:Deposit
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 Los Santos W deposit, Los Santos, Salamanca, Castile and Leon, Spain
Data Identifiers
Mindat Occurrence Record ID:1706864
Long-form Identifier:1:3:1706864:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
39.5km (24.6 miles) ⓘMimosa Mine, Aldehuela de la Bóveda, Salamanca, Castile and Leon, Spain
42.9km (26.7 miles) ⓘGolpejas Mining Group, Golpejas, Salamanca, Castile and Leon, Spain
47.1km (29.2 miles) ⓘVillafranca de la Sierra quarry, Villafranca de la Sierra, Ávila, Castile and Leon, Spain
85.4km (53.1 miles) ⓘGold deposits (incl. Saturno Mine; Los Espinos Valley), Barruecopardo, Salamanca, Castile and Leon, Spain
93.6km (58.1 miles) ⓘBarruecopardo Mine, Barruecopardo, Salamanca, Castile and Leon, Spain
97.1km (60.4 miles) ⓘPortugal 1 & 2 quarries, Malpartida, Malpartida e Vale de Coelha, Almeida, Guarda, Portugal
References
Losantos, Emma; Borrajo, Iñigo; Losada, Iván; Boixet, Lluís; Castelo Branco, José M.; Tornos, Fernando (2025) Sn and W mineralisation in the Iberian Peninsula. Ore Geology Reviews, 179. 106542 doi:10.1016/j.oregeorev.2025.106542
Mota, Alexandra; Sant’Ovaia, Helena; Fádon, Oscar; Noronha, Fernando (2026) The Geochemistry of Granites Associated with W-Sn Deposits of North and Central Portugal and Castilla-León in Spain. Minerals, 16 (8). doi:10.3390/min16080823
 
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