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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Tantalite from
Golpejas Mining Group, Golpejas, Salamanca, Castile and Leon, Spain


Locality type:Mine
Classification
Species:'Tantalite' (not an IMA approved species)
Formula:(Mn,Fe)(Ta,Nb)2O6
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tantalite data
Locality Data:Click here to view Golpejas Mining Group, Golpejas, Salamanca, Castile and Leon, Spain
Data Identifiers
Mindat Occurrence Record ID:1704165
Long-form Identifier:1:3:1704165:2
GUID (UUID V4):0
Nearest other occurrences of Tantalite
78.3km (48.7 miles) ⓘFeli deposit, La Fregeneda, Salamanca, Castile and Leon, Spain
85.3km (53.0 miles) ⓘLa Canalita Sn-rich pegmatitic dykes, Peñaparda, Salamanca, Castile and Leon, Spain
86.1km (53.5 miles) ⓘNave de Haver Mining Field, Nave de Haver, 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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