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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Biotite from
Gabbro Quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany


Locality type:Quarry
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Gabbro Quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany
Data Identifiers
Mindat Occurrence Record ID:30743
Long-form Identifier:1:3:30743:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.3km (0.8 miles) ⓘRiekensglück prospect, Schmalenberg cliff, Bad Harzburg, Goslar District, Lower Saxony, Germany
2.0km (1.3 miles) ⓘKaltes Tal, Bad Harzburg, Goslar District, Lower Saxony, Germany
26.1km (16.2 miles) ⓘMichaelstein, Blankenburg, Harz, Saxony-Anhalt, Germany
47.0km (29.2 miles) ⓘKönigshall-Hindenburg mine, Reyershausen, Bovenden, Göttingen District, Lower Saxony, Germany
67.0km (41.6 miles) ⓘBackenberg quarries, Güntersen, Adelebsen, Göttingen District, Lower Saxony, Germany
68.7km (42.7 miles) ⓘHoher Hagen, Dransfeld, Göttingen District, Lower Saxony, Germany
85.8km (53.3 miles) ⓘBlaue Kuppe, Eschwege, Werra-Meißner, Kassel Region, Hesse, Germany
91.6km (56.9 miles) ⓘAmsdorf lignite open pit, Amsdorf, Seegebiet Mansfelder Land, Mansfeld-Südharz, Saxony-Anhalt, Germany
References
Schnorrer-Köhler, G. (1988) Mineralogische Notizen IV. Der Aufschluss: 39: 153-168 (in German).
 
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