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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Chalcoalumite from
Brüderbund Mine, Kohlenbach Valley, Eiserfeld, Siegen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany


Locality type:Mine
Classification
Species:Chalcoalumite
Formula:CuAl4(SO4)(OH)12 · 3H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcoalumite data
Locality Data:Click here to view Brüderbund Mine, Kohlenbach Valley, Eiserfeld, Siegen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:648697
Long-form Identifier:1:3:648697:6
GUID (UUID V4):0
Nearest other occurrences of Chalcoalumite
1.8km (1.1 miles) ⓘEisenzecher Zug mine, Eiserfeld, Siegen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
2.9km (1.8 miles) ⓘBreimehl Mine, Brachbach, Kirchen (Sieg), Altenkirchen, Rhineland-Palatinate, Germany
4.4km (2.7 miles) ⓘKnappschaftsglück Mine, Neunkirchen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
6.2km (3.8 miles) ⓘWolf Mine, Herdorf, Daaden-Herdorf, Altenkirchen, Rhineland-Palatinate, Germany
12.4km (7.7 miles) ⓘKäusersteimel Mine, Kausen, Betzdorf-Gebhardshain, Altenkirchen, Rhineland-Palatinate, Germany
15.2km (9.4 miles) ⓘFriedrich Mine, Steckenstein, Mittelhof, Wissen, Altenkirchen, Rhineland-Palatinate, Germany
17.5km (10.9 miles) ⓘBrüche Mine, Ferndorf, Kreuztal, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
17.7km (11.0 miles) ⓘWildermann Mine, Ferndorf, Kreuztal, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
49.9km (31.0 miles) ⓘCastor Mine, Loope, Engelskirchen, Oberbergischer Kreis, Cologne, North Rhine-Westphalia, Germany
62.5km (38.8 miles) ⓘFriedrichssegen Mine, Friedrichssegen, Lahnstein, Rhein-Lahn-Kreis, Rhineland-Palatinate, Germany
References
Henrich, M. (2009): Mineralien-Welt 20 (5), 14-27.
 
and/or  
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