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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Opal from
Basalt quarry, Hohenseelbachskopf, Neunkirchen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany


Locality type:Quarry
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Basalt quarry, Hohenseelbachskopf, Neunkirchen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:1007253
Long-form Identifier:1:3:1007253:8
GUID (UUID V4):0
Nearest other occurrences of Opal
43.6km (27.1 miles) ⓘDünsberg, Königsberg, Biebertal, Giessen, Giessen Region, Hesse, Germany
49.7km (30.9 miles) ⓘNeumühlberg quarry (Steinsberg quarry), Biebrich, Aar-Einrich, Rhein-Lahn-Kreis, Rhineland-Palatinate, Germany
54.2km (33.7 miles) ⓘStenzelberg, Königswinter, Rhein-Sieg-Kreis, Cologne, North Rhine-Westphalia, Germany
54.3km (33.7 miles) ⓘVirneberg Mine, Rheinbreitbach, Unkel, Neuwied, Rhineland-Palatinate, Germany
54.5km (33.8 miles) ⓘWeilberg (Großer Weilberg), Königswinter, Rhein-Sieg-Kreis, Cologne, North Rhine-Westphalia, Germany
55.1km (34.3 miles) ⓘSchiffenberg quarry, Hausen, Pohlheim, Giessen, Giessen Region, Hesse, Germany
55.3km (34.4 miles) ⓘQuegstein, Wintermühlenhof, Königswinter, Rhein-Sieg-Kreis, Cologne, North Rhine-Westphalia, Germany
57.1km (35.5 miles) ⓘRabenlay (Rabenley), Oberkassel, Beuel, Bonn, Cologne, North Rhine-Westphalia, Germany
58.9km (36.6 miles) ⓘAttenberg quarry, Großen-Buseck, Buseck, Giessen, Giessen Region, Hesse, Germany
58.9km (36.6 miles) ⓘLyngsberg (Lühnsberg; Lünsberg), Bad Godesberg, Bonn, Cologne, North Rhine-Westphalia, Germany
References
Haege, T. (1887): Die Mineralien des Siegerlandes und der angrenzenden Gebiete. 50 pp.
 
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