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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Dickite from
Anna mine, Alsdorf, Aachen, Cologne, North Rhine-Westphalia, Germany


Locality type:Colliery
Classification
Species:Dickite
Formula:Al2(Si2O5)(OH)4
Comments:Analysis in: Gussone, R. (1961): Die Blei-Zinkerz-Lagerstätten der Gegend von Aachen. Der Aufschluss, special edition no. 10: Mineralogische und geologische Streifzüge durch die nördliche Eifel, pp. 19-25.
Habit:Powdery masses, consisting of microscopic tabular crystals to about 30 µm
Colour:white
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Dickite data
Locality Data:Click here to view Anna mine, Alsdorf, Aachen, Cologne, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:85568
Long-form Identifier:1:3:85568:6
GUID (UUID V4):0
Nearest other occurrences of Dickite
7.9km (4.9 miles) ⓘLaura mine, Eygelshoven, Kerkrade, Limburg, Netherlands
13.9km (8.7 miles) ⓘEmma-Hendrik coal dump, Brunssum, Limburg, Netherlands
14.5km (9.0 miles) ⓘHendrik mine, Brunssum, Limburg, Netherlands
16.2km (10.1 miles) ⓘEmma mine, Brunssum, Limburg, Netherlands
24.5km (15.2 miles) ⓘMaubacher Bleiberg, Hürtgenwald, Düren, Cologne, North Rhine-Westphalia, Germany
45.2km (28.1 miles) ⓘWérister coal dump, Romsée, Fléron, Liège, Wallonia, Belgium
47.9km (29.7 miles) ⓘTanzberg Mine, Kall, Euskirchen, Cologne, North Rhine-Westphalia, Germany
48.1km (29.9 miles) ⓘChartreuse coal dump, Liège, Liège, Wallonia, Belgium
48.3km (30.0 miles) ⓘWinterslag colliery, Winterslag, Genk, Limburg, Flanders, Belgium
48.7km (30.3 miles) ⓘZwartberg colliery, Zwartberg, Genk, Limburg, Flanders, Belgium
References
Maas, H. H. (1977) Neuere Mineralienfunde im Aachener Steinkohlenrevier. Der Aufschluss, 28 (2) 69-73
 
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