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


00786070017362566193244.jpg
Thomsonite-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
08275160017272023169700.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
05186720017272023182196.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
03016080017272023205934.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
00786070017362566193244.jpg
Thomsonite-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09264960017367676986966.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
00049010017367677004634.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
01491550017367677011773.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09713020017367677013305.jpg
Thomsonite-Ca

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
00694270017272023223819.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
05186720017272023182196.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
03016080017272023205934.jpg
Thomsonite-Ca, etc.

Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Locality type:Quarry
Classification
Species:Thomsonite-Ca
Formula:NaCa2[Al5Si5O20] · 6H2O
Habit:radial aggregates with fibrous to stem-like crystals up to 1mm. Some aggregates reach up to 1cm.
Colour:white to colourless
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Phillipsite Subgroup33
Calcite20
Mesolite10
Natrolite10
Chabazite-Ca6
Montmorillonite5
Apophyllite Group4
Gismondine-Ca4
Pyrite2
Goethite2
Tobermorite2
Gyrolite1
Aragonite1
Thaumasite1
Data
Mineral Data:Click here to view Thomsonite-Ca data
Locality Data:Click here to view Arensberg, Zilsdorf, Walsdorf, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Photo GalleryView Gallery (52 photos)
Data Identifiers
Mindat Occurrence Record ID:29303
Long-form Identifier:1:3:29303:5
GUID (UUID V4):0
Nearest other occurrences of Thomsonite-Ca
4.3km (2.7 miles) ⓘGraulay quarry, Hillesheim, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
9.2km (5.7 miles) ⓘRother Kopf, Roth, Gerolstein, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
15.4km (9.6 miles) ⓘLöhley, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
17.0km (10.6 miles) ⓘBeilstein, Bereborn, Kelberg, Vulkaneifel, Rhineland-Palatinate, Germany
22.3km (13.9 miles) ⓘHöchstberg (Schwarzley; Schwarzlay), Höchstberg, Kelberg, Vulkaneifel, Rhineland-Palatinate, Germany
25.9km (16.1 miles) ⓘHochbermel, Bermel, Vordereifel, Mayen-Koblenz, 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
36.4km (22.6 miles) ⓘMayener Feld, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
37.0km (23.0 miles) ⓘXenolith CS-008 (Bellbergite 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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