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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
Carvalhal Mine, Melides, Grândola, 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 Carvalhal Mine, Melides, Grândola, Setúbal, Portugal
Data Identifiers
Mindat Occurrence Record ID:1009218
Long-form Identifier:1:3:1009218:9
GUID (UUID V4):0
Nearest other occurrences of Opal
44.9km (27.9 miles) ⓘPalhais No. 1 Mine, Palhais, Palhais e Coina, Barreiro, Setúbal, Portugal
74.7km (46.4 miles) ⓘHerdade dos Pendões Mine, São Luís, Odemira, Beja, Portugal
References
LNEG - Siorminp database information
 
and/or  
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