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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Natron from
Saint-Nonna church, Penmarc'h, Quimper, Finistère, Brittany, France


Classification
Species:Natron
Formula:Na2CO3 · 10H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Natron data
Locality Data:Click here to view Saint-Nonna church, Penmarc'h, Quimper, Finistère, Brittany, France
Data Identifiers
Mindat Occurrence Record ID:1024311
Long-form Identifier:1:3:1024311:8
GUID (UUID V4):0
References
Chauris, L. (2014) Minéraux de Bretagne [Minerals of Brittany]. Les Editions du Piat. 336pp.p.156
 
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