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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Bismutite from
Miguel Vacas Mine, Nossa Senhora da Conceição e São Bartolomeu, Vila Viçosa, Évora, Portugal


Locality type:Pit
Classification
Species:Bismutite
Formula:(BiO)2CO3
Comments:Analyses carried out at the Instituto de Geología, Universidad Nacional Autónoma de México (information provided by Alejandro Felix Gutierrez, March 2026).
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Bismutite data
Locality Data:Click here to view Miguel Vacas Mine, Nossa Senhora da Conceição e São Bartolomeu, Vila Viçosa, Évora, Portugal
Data Identifiers
Mindat Occurrence Record ID:1900363
Long-form Identifier:1:3:1900363:8
GUID (UUID V4):0
Nearest other occurrences of Bismutite
79.3km (49.2 miles) ⓘMonchi Mine, Burguillos del Cerro, Badajoz, Extremadura, Spain
References
Instituto de geología colletion (UNAM)Identified by Alejandro Felix Gutierrez: XRD
Analyses carried out at the Instituto de Geología, Universidad Nacional Autónoma de México (information provided by Alejandro Felix Gutierrez, March 2026)Identification: XRD, SEM-EDS
 
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