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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Pyrolusite from
Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal


Locality type:Mine
Classification
Species:Pyrolusite
Formula:Mn4+O2
Comments:Pyrolusite has yet to be verified from a granite pegmatite. Black "manganese dendrites" have never been identified as "pyrolusite". See Potter, R. and Rossman, G, 1979, Mineralogy of Manganese Dendrites and Coatings, American Mineralogist, v. 64, p. 1219-1226. Most black coatings are hollandite group, nsutite, birnessite, etc.
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Pyrolusite data
Locality Data:Click here to view Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal
Data Identifiers
Mindat Occurrence Record ID:458787
Long-form Identifier:1:3:458787:3
GUID (UUID V4):0
Nearest other occurrences of Pyrolusite
21.2km (13.2 miles) ⓘReal quarry, Real, Penalva do Castelo, Viseu, Portugal
78.7km (48.9 miles) ⓘFreixial Mine, Moita, Anadia, Aveiro, Portugal
81.7km (50.8 miles) ⓘBarranco do Linhó (Vales da Cepa e de Enxutos) Mines, Luso, Mealhada, Aveiro, Portugal
82.6km (51.4 miles) ⓘSanta Cristina (Fervença) Mine, Vacariça, Mealhada, Aveiro, Portugal
93.8km (58.3 miles) ⓘRibeiro do Souto Mine, Salvador, Penamacor, Castelo Branco, Portugal
93.8km (58.3 miles) ⓘVieiro do Almagre Mine, Salvador, Penamacor, Castelo Branco, Portugal
References
 
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