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
Cova dos Mouros Mine, Marrancos e Arcozelo, Vila Verde, Braga, Portugal


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 Cova dos Mouros Mine, Marrancos e Arcozelo, Vila Verde, Braga, Portugal
Data Identifiers
Mindat Occurrence Record ID:1676668
Long-form Identifier:1:3:1676668:4
GUID (UUID V4):0
Nearest other occurrences of Cassiterite
6.7km (4.2 miles) ⓘSão Salvador Mine, Rebordões (Souto), Ponte de Lima, Viana do Castelo, Portugal
7.9km (4.9 miles) ⓘCarapita Mine, Rebordões (Souto), Ponte de Lima, Viana do Castelo, Portugal
7.9km (4.9 miles) ⓘPortos Mine, Rebordões (Souto), Ponte de Lima, Viana do Castelo, Portugal
8.0km (5.0 miles) ⓘAbelheiras Mine, Cervães, Vila Verde, Braga, Portugal
9.7km (6.0 miles) ⓘCachadinhas and Monte do Castelo Mine, Navió e Vitorino dos Piães, Ponte de Lima, Viana do Castelo, Portugal
13.8km (8.6 miles) ⓘVieiros Mine, Cabreiros, Cabreiros e Passos (São Julião), Braga, Braga, Portugal
14.1km (8.8 miles) ⓘS. Gens Mine, Mire de Tibães, Braga, Braga, Portugal
16.5km (10.2 miles) ⓘBalsas Mine, São Pedro d'Arcos, Ponte de Lima, Viana do Castelo, Portugal
16.9km (10.5 miles) ⓘRasas e Cobalto Mines, Torre e Vila Mou, Viana do Castelo, Viana do Castelo, Portugal
16.9km (10.5 miles) ⓘCabanas Mine, Arcozelo, Ponte de Lima, Viana do Castelo, Portugal
References
Oliveira, Daniel P. S. de, Silva, Teresa P., Morais, Igor, Fernandes, João A. E. (2025) Chemical and Mineralogical Characterization of Waste from Abandoned Copper and Manganese Mines in the Iberian Pyrite Belt, Portugal: A First Step Towards the Waste-to-Value Recycling Process. Minerals, 15 (1). doi:10.3390/min15010058
 
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