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


Locality type:Quarry
Classification
Species:Acanthite
Formula:Ag2S
Comments:Acanthite occurs as fibrous radiating tufts of black crystals less than 100 µm in size, deposited on dendrites of native silver. The X-ray powder pattern is similar to that of synthetic acanthite (JCPDS 14-72). Qualitative chemical analysis confirms the presence of major Ag and S, together with minor Cu, Zn, and Cl.
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Data
Mineral Data:Click here to view Acanthite data
Locality Data:Click here to view Sur les Roches quarry, Bastogne, Luxembourg, Wallonia, Belgium
Data Identifiers
Mindat Occurrence Record ID:85125
Long-form Identifier:1:3:85125:5
GUID (UUID V4):0
Nearest other occurrences of Acanthite
39.9km (24.8 miles) ⓘLes Rochettes quarries, Bertrix, Luxembourg, Wallonia, Belgium
48.7km (30.3 miles) ⓘBertha shaft, Neue Hoffnung Mine, Bleialf, Prüm, Bitburg-Prüm, Rhineland-Palatinate, Germany
73.5km (45.7 miles) ⓘSclaigneaux slag locality, Seilles, Andenne, Namur, Wallonia, Belgium
92.2km (57.3 miles) ⓘMünsterbusch zinc smelter slag locality, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
93.4km (58.0 miles) ⓘBirkengang zinc smelter slag locality, Stolberg, Aachen, Cologne, North Rhine-Westphalia, Germany
98.1km (61.0 miles) ⓘAnnenberg, Monzelfeld, Bernkastel-Kues, Bernkastel-Wittlich, Rhineland-Palatinate, 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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