Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Pyrolusite from
Zufriedenheit Mine, Mausbach, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany


Locality type:Mine
Classification
Species:Pyrolusite
Formula:Mn4+O2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pyrolusite data
Locality Data:Click here to view Zufriedenheit Mine, Mausbach, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:85685
Long-form Identifier:1:3:85685:2
GUID (UUID V4):0
Nearest other occurrences of Pyrolusite
1.2km (0.7 miles) ⓘDiepenlinchen Mine, Mausbach, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
1.4km (0.9 miles) ⓘHenriette Shaft, Diepenlinchen Mine, Mausbach, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
4.6km (2.8 miles) ⓘBreinigerberg Mine, Breinig, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
26.6km (16.5 miles) ⓘHerzogenhügel, Ternell, Eupen, Liège, Wallonia, Belgium
26.6km (16.5 miles) ⓘMembach mine, Baelen, Liège, Wallonia, Belgium
32.2km (20.0 miles) ⓘGemeentegrot quarry, Valkenburg aan de Geul, Limburg, Netherlands
32.5km (20.2 miles) ⓘSibbe quarry, Sibbe, Valkenburg aan de Geul, Limburg, Netherlands
33.8km (21.0 miles) ⓘMechernicher Bleiberg, Mechernich, Euskirchen, Cologne, North Rhine-Westphalia, Germany
34.5km (21.4 miles) ⓘTanzberg Mine, Kall, Euskirchen, Cologne, North Rhine-Westphalia, Germany
41.1km (25.5 miles) ⓘPietersberg, Maastricht, Limburg, Netherlands
References
Aufschluss 90(2), 111-130
 
and/or  
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