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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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Gismondine-Ca from
Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany


00849070017272039325317.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09620970017272022633950.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
04009640017272022651402.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
06244430017805000695141.jpg
Gismondine-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
05742780017369411476279.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
08558840017369411474612.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09847130017369411478794.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
03255230017804933075295.jpg
Gismondine-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
00849070017272039325317.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09620970017272022633950.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
04009640017272022651402.jpg
Gismondine-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
06244430017805000695141.jpg
Gismondine-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Locality type:Quarry
Classification
Species:Gismondine-Ca
Formula:CaAl2Si2O8 · 4H2O
Habit:tetragonal dipyramids up to 4mm; multiple-twinned crystals holding out a higher symmetry than monoclinic.
Colour:colourless
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Phillipsite Subgroup35
Tobermorite8
Calcite5
Gyrolite4
Thomsonite-Ca4
Mesolite2
Thaumasite1
Data
Mineral Data:Click here to view Gismondine-Ca data
Locality Data:Click here to view Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Photo GalleryView Gallery (41 photos)
Data Identifiers
Mindat Occurrence Record ID:29286
Long-form Identifier:1:3:29286:9
GUID (UUID V4):0
Nearest other occurrences of Gismondine-Ca
4.3km (2.7 miles) ⓘGraulay quarry, Hillesheim, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
5.3km (3.3 miles) ⓘRockeskyller Kopf summit, Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
13.9km (8.6 miles) ⓘKalem, Birresborn, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
15.4km (9.6 miles) ⓘLöhley, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
16.4km (10.2 miles) ⓘEmmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
34.0km (21.1 miles) ⓘHannebacher Ley, Hannebach, Spessart, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
34.6km (21.5 miles) ⓘSchellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
36.4km (22.6 miles) ⓘCaspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
37.0km (23.0 miles) ⓘXenolith CS-008 (Bellbergite type-locality), Seekante, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
37.1km (23.1 miles) ⓘXenolith CS-090 (Hopmannite type locality), Seekante, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
References
Hentschel, G. (1973) Begleitmineralien des Basaltes vom Arensberg bei Zilsdorf, Eifel. Notizbl. hess. L.-Amt Bodenforsch. 101, 310-316.
Doornveld, H.Y. (1987) Enkele mineraalvoorkomens in de Eifel. GEA, 20 (1), 32-36 (in Dutch).
 
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