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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Chalcedony from
Póvoa de Cervães Mine, Santiago de Cassurrães e Póvoa de Cervães, Mangualde, Viseu, Portugal


Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Póvoa de Cervães Mine, Santiago de Cassurrães e Póvoa de Cervães, Mangualde, Viseu, Portugal
Data Identifiers
Mindat Occurrence Record ID:890580
Long-form Identifier:1:3:890580:2
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
41.6km (25.8 miles) ⓘBendada Mines, Bendada, Sabugal, Guarda, Portugal
57.8km (35.9 miles) ⓘAlto das Quelhas do Gestoso Mine, Gestoso, Manhouce, São Pedro do Sul, Viseu, Portugal
68.7km (42.7 miles) ⓘPalhal Mine, Branca, Albergaria-a-Velha, Aveiro, Portugal
69.1km (42.9 miles) ⓘTelhadela Mine, Ribeira de Fráguas, Albergaria-a-velha, Aveiro, Portugal
95.6km (59.4 miles) ⓘMacieira, Cerva e Limões, Ribeira de Pena, Vila Real, Portugal
References
LNEG - Laboratório Nacional de Energia e Geologia, Siorminp databse ref "1285U"
 
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