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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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Chrysocolla from
Sur les Roches quarry, Bastogne, Luxembourg, Wallonia, Belgium


Locality type:Quarry
Classification
Species:Chrysocolla
Formula:Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Comments:"The turquoise blue coatings of chrysocolla resemble wroewolfeite but can be distinguished by their conchoidal fracture. The mineral has been identified by X-ray diffraction and its composition confirmed by a chemical analysis. In addition to Si and Cu, Zn, Mn, Fe, Ca and S exist as minor elements." (Hatert et al., 2000).
Colour:turquoise blue
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Data
Mineral Data:Click here to view Chrysocolla data
Locality Data:Click here to view Sur les Roches quarry, Bastogne, Luxembourg, Wallonia, Belgium
Data Identifiers
Mindat Occurrence Record ID:85127
Long-form Identifier:1:3:85127:3
GUID (UUID V4):0
Nearest other occurrences of Chrysocolla
31.4km (19.5 miles) ⓘStolzembourg Copper Mine, Stolzembourg, Putscheid, Canton Vianden, Luxembourg
32.8km (20.4 miles) ⓘThier des Carrières, Cahay, Vielsalm, Luxembourg, Wallonia, Belgium
73.4km (45.6 miles) ⓘGraulay quarry, Hillesheim, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
73.5km (45.7 miles) ⓘSclaigneaux slag locality, Seilles, Andenne, Namur, Wallonia, Belgium
75.9km (47.2 miles) ⓘKahlenberg, Oberstadtfeld, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
86.1km (53.5 miles) ⓘA8 roadcut, Weiler, Merzig, Merzig-Wadern, Saarland, Germany
98.1km (61.0 miles) ⓘAnnenberg, Monzelfeld, Bernkastel-Kues, Bernkastel-Wittlich, Rhineland-Palatinate, Germany
98.1km (61.0 miles) ⓘArweiler Quarry, Reimsbach, Beckingen, Merzig-Wadern, Saarland, Germany
References
Hatert, F., Deliens, M., Houssa, M., Coune, F. (2000) Native gold, native silver and secondary minerals in the quartz veins from Bastogne, Belgium. Bulletin de l'Institut royal des Sciences naturelles de Belgique, Sciences de la Terre, 70, 223-229.
Hatert, F., Deliens, M., Fransolet, A.-M., Van Der Meersche, E. (2002) Les minéraux de Belgique (2nd ed.) Muséum des Sciences Naturelles, Bruxelles.
 
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