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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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Aegirine-augite from
Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany


Locality type:Quarry
Classification
Species:Aegirine-augite
Formula:(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Aegirine-augite data
Locality Data:Click here to view Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:422679
Long-form Identifier:1:3:422679:6
GUID (UUID V4):0
Nearest other occurrences of Aegirine-augite
15.0km (9.3 miles) ⓘAuf Dickel (incl. Nonnental), Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
15.7km (9.8 miles) ⓘGoßberg, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
17.1km (10.6 miles) ⓘGraulay quarry, Hillesheim, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
35.5km (22.0 miles) ⓘIn der Ahl Quarry, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
37.8km (23.5 miles) ⓘCaspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
38.2km (23.7 miles) ⓘRodder Höfe, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
40.1km (24.9 miles) ⓘKappiger Ley (Kappiger Lay), Wehr, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
40.5km (25.1 miles) ⓘSchellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
41.8km (26.0 miles) ⓘThelenberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
42.8km (26.6 miles) ⓘPumice quarries, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
References
Blass, G., Emmerich, F., Graf, HW., Schäfer, Ch., Tschörtner, J., (2006): Minerale der Eifelvulkane, Version 1.0, CD, published by authors
 
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