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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Manganese Oxides from
Genna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany


Locality type:Slag Locality
Classification
Species:'Manganese Oxides' (not an IMA approved species)
Formation:Post-mining/Anthropogenic
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Manganese Oxides data
Locality Data:Click here to view Genna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:1016267
Long-form Identifier:1:3:1016267:3
GUID (UUID V4):0
Nearest other occurrences of Manganese Oxides
53.4km (33.2 miles) ⓘFöckinghausen quarry, Bestwig, Hochsauerlandkreis, Arnsberg, North Rhine-Westphalia, Germany
69.6km (43.2 miles) ⓘWolf Mine, Herdorf, Daaden-Herdorf, Altenkirchen, Rhineland-Palatinate, Germany
97.1km (60.4 miles) ⓘWachenfeld Quarry, Nieder-Werbe, Waldeck, Waldeck-Frankenberg, Kassel Region, Hesse, Germany
97.6km (60.6 miles) ⓘWettringen limestone works, Wettringen, Steinfurt, Münster, North Rhine-Westphalia, Germany
References
Bender, D.; Krimmelbein, W. (1994) Aktuelle Übersicht: Mineralien der Zinkhütte Genna/Sauerland [Current overview: Minerals from the Genna/Sauerland zinc smelter]. Mineralien Welt, 5 (4). 10
 
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