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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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Nosean from
Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany


Locality type:Quarry
Classification
Species:Nosean
Formula:Na8(Al6Si6O24)(SO4) · H2O
Colour:pale violet-blue
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Nosean data
Locality Data:Click here to view Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:76537
Long-form Identifier:1:3:76537:4
GUID (UUID V4):0
Nearest other occurrences of Nosean
15.0km (9.3 miles) ⓘAuf Dickel (incl. Nonnental), Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
23.7km (14.7 miles) ⓘSelberg, Quiddelbach, Adenau, Ahrweiler, Rhineland-Palatinate, Germany
25.4km (15.8 miles) ⓘNiveligsberg, Drees, Kelberg, Vulkaneifel, Rhineland-Palatinate, Germany
37.0km (23.0 miles) ⓘMayener Feld, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
37.1km (23.0 miles) ⓘHöhe 512.7, Riedener Berg, Weibern, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
38.1km (23.7 miles) ⓘSchorenberg, Rieden, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
38.2km (23.7 miles) ⓘRodder Höfe, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
39.8km (24.7 miles) ⓘAuf der Hell, Bell, 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
References
Brauns, Reinhard (1922) Die Mineralien der Niederrheinischen Vulkangebiete - Mit besonderer Berücksichtigung ihrer Bildung und Umbildung. E. Schweizerbart'sche Verlagsbuchhandlung.
Blaß, G.; Kruijen, F. (2015) Die Neuigkeiten aus der Vulkaneifel (II/2015). Mineralien-Welt, 26 (5). 80-90
 
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