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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Stilpnomelane from
Bois-de-la-Roche quarry, Saint-Aubin-des-Châteaux, Châteaubriant-Ancenis, Loire-Atlantique, Pays de la Loire, France


Locality type:Quarry
Classification
Species:Stilpnomelane
Formula:K4Fe482+[Si64Al8]O164(OH)52 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Stilpnomelane data
Locality Data:Click here to view Bois-de-la-Roche quarry, Saint-Aubin-des-Châteaux, Châteaubriant-Ancenis, Loire-Atlantique, Pays de la Loire, France
Data Identifiers
Mindat Occurrence Record ID:211005
Long-form Identifier:1:3:211005:9
GUID (UUID V4):0
References
De Ascenção Guedes, Roger (2005) La goyazite de Saint-Aubin des-Châteaux (Loire-Atlantique) [Goyazite from Saint-Aubin des-Châteaux (Loire-Atlantique)]. Le Règne Minéral, 11 (65). 9
 
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