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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Heulandite Subgroup from
Mühlberg Quarry, Billings, Fischbachtal, Darmstadt-Dieburg, Darmstadt, Hesse, Germany


Locality type:Quarry
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Mühlberg Quarry, Billings, Fischbachtal, Darmstadt-Dieburg, Darmstadt, Hesse, Germany
Data Identifiers
Mindat Occurrence Record ID:249441
Long-form Identifier:1:3:249441:8
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
7.0km (4.4 miles) ⓘKreuzer & Böhringer Quarry, Das Buch, Lindenfels, Bergstraße, Darmstadt, Hesse, Germany
8.5km (5.3 miles) ⓘEmmertsberg quarry, Waschenbach, Mühltal, Darmstadt-Dieburg, Darmstadt, Hesse, Germany
9.2km (5.7 miles) ⓘGlasberg quarry, Nieder-Beerbach, Mühltal, Darmstadt-Dieburg, Darmstadt, Hesse, Germany
10.6km (6.6 miles) ⓘAorite quarry (Bitsch Quarry; Am Bannels), Erlenbach, Fürth, Bergstraße, Darmstadt, Hesse, Germany
15.9km (9.9 miles) ⓘRöhrig quarry (Röhrig gravel works), Kohlplatte, Sonderbach, Heppenheim, Bergstraße, Darmstadt, Hesse, Germany
37.6km (23.4 miles) ⓘStahl quarry, Dörrmorsbach, Haibach, Aschaffenburg District, Lower Franconia, Bavaria, Germany
69.9km (43.4 miles) ⓘGaulsberg quarry, Ortenberg, Wetteraukreis, Darmstadt, Hesse, Germany
References
E. Nickel, M. Fettel: "Odenwald", Sammlung geologischer Führer Bd. 65, 2nd ed., Bornträger (Berlin, Stuttgart), 1985
 
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