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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Tridymite from
Winfeld, Kottenheim, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany


Locality type:Mining Area
Classification
Species:Tridymite
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tridymite data
Locality Data:Click here to view Winfeld, Kottenheim, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:611684
Long-form Identifier:1:3:611684:2
GUID (UUID V4):0
Nearest other occurrences of Tridymite
0.5km (0.3 miles) ⓘCaspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
1.6km (1.0 miles) ⓘEttringer Feld, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
2.3km (1.4 miles) ⓘMayener Feld, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.0km (1.9 miles) ⓘIn der Ahl Quarry, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.8km (2.4 miles) ⓘBasalt quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
4.5km (2.8 miles) ⓘScoria quarry, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
5.5km (3.4 miles) ⓘRothenberg Quarry, Bell, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
8.6km (5.4 miles) ⓘTönchesberg, Kruft, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
9.1km (5.7 miles) ⓘNickenicher Weinberg, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
9.8km (6.1 miles) ⓘNickenicher Sattel, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
References
Lehmann, J. (1877) Die pyrogenen Quarze in den Laven des Niederrheins. Verhandlungen des naturhistorischen Vereins der preußischen Rheinlande und Westfalens: 34: 203-226. https://www.zobodat.at/pdf/Verh-nathist-Ver-preuss-Rheinlande_34_0203-0226.pdf
 
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