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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Opal from
Palhais No. 1 Mine, Palhais, Palhais e Coina, Barreiro, Setúbal, Portugal


Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Palhais No. 1 Mine, Palhais, Palhais e Coina, Barreiro, Setúbal, Portugal
Data Identifiers
Mindat Occurrence Record ID:1009060
Long-form Identifier:1:3:1009060:4
GUID (UUID V4):0
Nearest other occurrences of Opal
44.9km (27.9 miles) ⓘCarvalhal Mine, Melides, Grândola, Setúbal, Portugal
79.7km (49.5 miles) ⓘEspadanal Mines, Rio Maior, Rio Maior, Santarém, Portugal
80.1km (49.8 miles) ⓘQuinta do Jardim Mine, Santa Maria e São Pedro e Sobral da Lagoa, Óbidos, Leiria, Portugal
References
LNEG - Siorminp
 
and/or  
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