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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Gibbsite from
Cox Quarry, Lückerath, Bergisch Gladbach, Rheinisch-Bergischer Kreis, Cologne, North Rhine-Westphalia, Germany


Locality type:Quarry
Classification
Species:Gibbsite
Formula:Al(OH)3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gibbsite data
Locality Data:Click here to view Cox Quarry, Lückerath, Bergisch Gladbach, Rheinisch-Bergischer Kreis, Cologne, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:925449
Long-form Identifier:1:3:925449:7
GUID (UUID V4):0
Nearest other occurrences of Gibbsite
54.0km (33.5 miles) ⓘGenna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany
60.3km (37.5 miles) ⓘSchellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
61.2km (38.0 miles) ⓘEisenzecher Zug mine, Eiserfeld, Siegen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
83.5km (51.9 miles) ⓘFriedrichssegen Mine, Friedrichssegen, Lahnstein, Rhein-Lahn-Kreis, Rhineland-Palatinate, Germany
86.4km (53.7 miles) ⓘRabotrath mine, Walhorn, Lontzen, Liège, Wallonia, Belgium
96.4km (59.9 miles) ⓘGeulhem quarry, Geulhem, Berg en Terblijt, Valkenburg aan de Geul, Limburg, Netherlands
97.5km (60.6 miles) ⓘCurfs quarry, Berg en Terblijt, Valkenburg aan de Geul, Limburg, Netherlands
References
Kautz, Karl (1968) Ein Vorkommen von Alumohydrocalcit und Allophan bei Bergisch-Gladbach. Neues Jahrbuch für Mineralogie, Monatshefte, 350-358.
 
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