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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Greisen from
Matamala Mine, Matilla de los Caños del Río, Salamanca, Castile and Leon, Spain


Locality type:Mine
Classification
Type:Greisen
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Greisen data
Locality Data:Click here to view Matamala Mine, Matilla de los Caños del Río, Salamanca, Castile and Leon, Spain
Data Identifiers
Mindat Occurrence Record ID:1808972
Long-form Identifier:1:3:1808972:9
GUID (UUID V4):0
Nearest other occurrences of Greisen
1.4km (0.9 miles) ⓘAtalaya Mine, Matilla de los Caños del Río, Salamanca, Castile and Leon, Spain
5.6km (3.5 miles) ⓘEl Cubito Mine (Grupo minero Las Españas), Carrascal de Barregas, Salamanca, Castile and Leon, Spain
6.3km (3.9 miles) ⓘValle Largo Mine, Villalba de los Llanos, Salamanca, Castile and Leon, Spain
12.4km (7.7 miles) ⓘGolpejas Mining Group, Golpejas, Salamanca, Castile and Leon, Spain
14.5km (9.0 miles) ⓘLa Rescatada Mine, Aldehuela de la Bóveda, Salamanca, Castile and Leon, Spain
71.0km (44.1 miles) ⓘBarruecopardo Mine, Barruecopardo, Salamanca, Castile and Leon, Spain
77.9km (48.4 miles) ⓘMari Tere mine, Lumbrales, Salamanca, Castile and Leon, Spain
84.1km (52.3 miles) ⓘLa Canalita Sn-rich pegmatitic dykes, Peñaparda, Salamanca, Castile and Leon, Spain
93.1km (57.9 miles) ⓘTorrecilla de los Ángeles mine, Villasbuenas de Gata, Cáceres, Extremadura, Spain
References
Bermejo, Daniel; Ortega, Lorena; Barrios Sánchez, Santos; Tavazzani, Lorenzo; Castiñeiras, Pedro; Chelle-Michou, Cyril; Crespo, Elena; dos Santos Alves, Kelvin; Gómez-Barreiro, Juan (2025) Late Variscan tectonic orogenic collapse as a trigger for Sn-W mineralizing systems. U-Pb ore geochronology across the Martinamor gneissic dome (Salamanca, Spain). Ore Geology Reviews, 184. 106762 doi:10.1016/j.oregeorev.2025.106762
 
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