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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Montmorillonite from
Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany


09915830017360850833015.jpg
Montmorillonite

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
01298020017272022958420.jpg
Montmorillonite

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
05056800017803887192516.jpg
Montmorillonite, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09915830017360850833015.jpg
Montmorillonite

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09145690017805649047145.jpg
Montmorillonite

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
05993670017803882947033.jpg
Montmorillonite, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09915830017360850833015.jpg
Montmorillonite

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
01298020017272022958420.jpg
Montmorillonite

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
05056800017803887192516.jpg
Montmorillonite, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Locality type:Quarry
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Thomsonite-Ca5
Phillipsite Subgroup4
Natrolite1
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:29294
Long-form Identifier:1:3:29294:8
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
4.3km (2.7 miles) ⓘGraulay quarry, Hillesheim, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
4.5km (2.8 miles) ⓘAuf Dickel (incl. Nonnental), Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
5.7km (3.5 miles) ⓘGiesenheld quarry, Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
6.6km (4.1 miles) ⓘRadersberg quarry, Dreis-Brück, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
8.5km (5.3 miles) ⓘWetschberg, Oberbettingen, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
10.6km (6.6 miles) ⓘBurgkopf, Hoffeld, Adenau, Ahrweiler, Rhineland-Palatinate, Germany
15.4km (9.6 miles) ⓘLöhley, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
15.9km (9.9 miles) ⓘSelberg, Quiddelbach, Adenau, Ahrweiler, Rhineland-Palatinate, Germany
16.3km (10.1 miles) ⓘTrachyte quarry, Reimerath, Kelberg, Vulkaneifel, Rhineland-Palatinate, Germany
16.4km (10.2 miles) ⓘEmmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
References
Hentschel, G. (1978) Die Mineralien des Arensberges bei Zilsdorf, Eifel. Der Aufschluß 29, 219-227.
 
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