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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Gypsum from
Zufriedenheit Mine, Mausbach, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany


Locality type:Mine
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Zufriedenheit Mine, Mausbach, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:85671
Long-form Identifier:1:3:85671:9
GUID (UUID V4):0
Nearest other occurrences of Gypsum
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
1.5km (1.0 miles) ⓘMeyer Quarry, Hastenrath, Eschweiler, Aachen, Cologne, North Rhine-Westphalia, Germany
1.7km (1.0 miles) ⓘAlbert Mine, Hastenrath, Eschweiler, Aachen, Cologne, North Rhine-Westphalia, Germany
2.5km (1.6 miles) ⓘBinsfeldhammer lead smelter slag locality, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
2.7km (1.7 miles) ⓘBirkengang zinc smelter slag locality, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
3.6km (2.2 miles) ⓘMünsterbusch zinc smelter slag locality, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
4.3km (2.7 miles) ⓘConcordia smelter slag locality, Eschweiler, Aachen, Cologne, North Rhine-Westphalia, Germany
4.6km (2.8 miles) ⓘBreinigerberg Mine, Breinig, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
12.7km (7.9 miles) ⓘMaubacher Bleiberg, Hürtgenwald, Düren, Cologne, North Rhine-Westphalia, Germany
References
Aufschluss 90(2), 111-130
 
and/or  
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