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


Locality type:Mine
Classification
Species:Cassiterite
Formula:SnO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Cassiterite data
Locality Data:Click here to view Golpejas Mining Group, Golpejas, Salamanca, Castile and Leon, Spain
Data Identifiers
Mindat Occurrence Record ID:1617419
Long-form Identifier:1:3:1617419:3
GUID (UUID V4):0
Localities for Cassiterite in this Region
Tita Mine, Golpejas Mining group, Golpejas, Salamanca, Castile and Leon, Spain
Nearest other occurrences of Cassiterite
8.7km (5.4 miles) ⓘMimosa Mine, Aldehuela de la Bóveda, Salamanca, Castile and Leon, Spain
9.6km (6.0 miles) ⓘLa Rescatada Mine, Aldehuela de la Bóveda, Salamanca, Castile and Leon, Spain
10.8km (6.7 miles) ⓘEl Cubito Mine (Grupo minero Las Españas), Carrascal de Barregas, Salamanca, Castile and Leon, Spain
11.2km (6.9 miles) ⓘAtalaya Mine, Matilla de los Caños del Río, Salamanca, Castile and Leon, Spain
11.3km (7.0 miles) ⓘValle Largo Mine, Villalba de los Llanos, Salamanca, Castile and Leon, Spain
12.4km (7.7 miles) ⓘMatamala Mine, Matilla de los Caños del Río, Salamanca, Castile and Leon, Spain
60.9km (37.8 miles) ⓘBarruecopardo Mine, Barruecopardo, Salamanca, Castile and Leon, Spain
68.0km (42.2 miles) ⓘBarquilla Sn-Ge-Cd-Cu-Fe Deposit, Villar de la Yegua, Salamanca, Castile and Leon, Spain
70.5km (43.8 miles) ⓘMari Tere mine, Lumbrales, Salamanca, Castile and Leon, Spain
70.8km (44.0 miles) ⓘVale da Urze Mine, Brunhozinho - Castanheira e Sanhoane, Mogadouro, Bragança, Portugal
References
López-Moro, Francisco Javier, Díez-Montes, Alejandro, Timón-Sánchez, Susana María, Llorens-González, Teresa, Sánchez-García, Teresa (2024) Peraluminous Rare Metal Granites in Iberia: Geochemical, Mineralogical, Geothermobarometric, and Petrogenetic Constraints. Minerals, 14 (3) 249 doi:10.3390/min14030249
Borrajo, Iñigo; Tornos, Fernando; Stein, Holly; Hanchar, John M. (2024) Geochronology and decoupling controls of Sn-(Ta-Li) and W-(Sn) mineralization in the Iberian Variscan Massif, Spain and Portugal. Ore Geology Reviews, 173. 106253 doi:10.1016/j.oregeorev.2024.106253
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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