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
Fontao mines, Silleda, Pontevedra, Galicia, 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 Fontao mines, Silleda, Pontevedra, Galicia, Spain
Data Identifiers
Mindat Occurrence Record ID:1651408
Long-form Identifier:1:3:1651408:1
GUID (UUID V4):0
Localities for Cassiterite in this Region
Angelita Mine, Fontao mines, Silleda, Pontevedra, Galicia, Spain
Tiro and Sidón mines, Fontao mines, Silleda, Pontevedra, Galicia, Spain
Nearest other occurrences of Cassiterite
10.4km (6.5 miles) ⓘLalín pegmatite field, Lalín, Pontevedra, Galicia, Spain
14.9km (9.2 miles) ⓘPresqueira pegmatite, Forcarei South pegmatite field, Forcarei, Pontevedra, Galicia, Spain
42.3km (26.3 miles) ⓘLa Sultana mine - La Sultana 2ª mine (Coto minero Gomesende), Ramírás, Ourense, Galicia, Spain
55.7km (34.6 miles) ⓘSan Finx Mines, Vilacova, Lousame, A Coruña, Galicia, Spain
56.9km (35.3 miles) ⓘPorriño quarries, Porriño, Pontevedra, Galicia, Spain
64.3km (40.0 miles) ⓘCeara Mine, Castro Laboreiro e Lamas de Mouro, Melgaço, Viana do Castelo, Portugal
70.2km (43.6 miles) ⓘSanta Comba Segunda Mine, Xuíz, Lugo, Lugo, Galicia, Spain
71.3km (44.3 miles) ⓘSanta Comba Mine (Barilongo mine), Santa Comba, A Coruña, Galicia, Spain
74.0km (46.0 miles) ⓘChã do Verialho No. 4 Mine, Formariz e Ferreira, Paredes de Coura, Viana do Castelo, Portugal
74.6km (46.4 miles) ⓘSão Silvestre No. 2 Mine, Formariz e Ferreira, Paredes de Coura, Viana do Castelo, Portugal
References
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
 
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