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
Ribeiro das Cantarinhas No. 1 Mine, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, 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 Ribeiro das Cantarinhas No. 1 Mine, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
Data Identifiers
Mindat Occurrence Record ID:906308
Long-form Identifier:1:3:906308:2
GUID (UUID V4):0
Nearest other occurrences of Cassiterite
3.6km (2.3 miles) ⓘFonte Monsantela Mine, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
3.7km (2.3 miles) ⓘGranite outcrop, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
5.0km (3.1 miles) ⓘFaísca Mine, Medelim, Idanha-a-Nova, Castelo Branco, Portugal
6.1km (3.8 miles) ⓘFonte do Casal Pelado Mine, União de Freguesias de Monsanto e Idanha-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
9.2km (5.7 miles) ⓘMatas da Rainha Mines - Carvoeira e Senhora da Granja, Proença-a-Velha, Idanha-a-Nova, Castelo Branco, Portugal
12.9km (8.0 miles) ⓘTapada dos Carvalhos e Carvalhal Mines, União de Freguesias Idanha-a-Nova e Alcafozes, Idanha-a-Nova, Castelo Branco, Portugal
14.9km (9.2 miles) ⓘMata da Rainha Mine, União de Freguesias de Pedrogão de S Pedro e Bemposta, Penamacor, Castelo Branco, Portugal
14.9km (9.2 miles) ⓘEspadanal Mine, União de Freguesias de Pedrogão de S Pedro e Bemposta, Penamacor, Castelo Branco, Portugal
14.9km (9.2 miles) ⓘCanchal da Terrinha Mine, Penamacor, Penamacor, Castelo Branco, Portugal
14.9km (9.2 miles) ⓘMonte Queimado Mine, União de Freguesias de Pedrogão de S Pedro e Bemposta, Penamacor, Castelo Branco, Portugal
References
LNEG - Laboratório Nacional de Energia e Geologia, Siorminp ID 1670Sn
 
and/or  
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