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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Sillimanite from
Segura Mines (Segura mining field), União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal


Locality type:Mine
Classification
Species:Sillimanite
Formula:Al2(SiO4)O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Segura Mines (Segura mining field), União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal
Data Identifiers
Mindat Occurrence Record ID:977353
Long-form Identifier:1:3:977353:0
GUID (UUID V4):0
Nearest other occurrences of Sillimanite
26.0km (16.1 miles) ⓘGranite outcrop, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
88.5km (55.0 miles) ⓘSítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
89.9km (55.9 miles) ⓘCabeço de Vide ultramafic complex, Alter do Chão, Portalegre, Portugal
References
Antunes, Isabel Margarida Horta Ribeiro, Neiva, Ana Margarida Ribeiro, Ramos, João Manuel Farinha, Silva, Paulo Bravo, Silva, Maria Manuela Vinha Guerreiro, Corfu, Fernando (2013) Petrogenetic links between lepidolite-subtype aplite-pegmatite, aplite veins and associated granites at Segura (central Portugal) Geochemistry, 73 (3) 323-341 doi:10.1016/j.chemer.2012.12.003
Gaspar, Miguel, Grácio, Nuno, Salgueiro, Rute, Costa, Mafalda (2022) Trace Element Geochemistry of Alluvial TiO2 Polymorphs as a Proxy for Sn and W Deposits. Minerals, 12 (10) 1248 doi:10.3390/min12101248
 
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