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
Huken Quarry, Grorud, Oslo, Norway


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 Huken Quarry, Grorud, Oslo, Norway
Data Identifiers
Mindat Occurrence Record ID:169671
Long-form Identifier:1:3:169671:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.5km (1.6 miles) ⓘKristiansen Quarry (Bånkall Quarry), Bånkall, Grorud, Oslo, Norway
3.3km (2.1 miles) ⓘTonsenplassen, Oslomarka, Oslo, Norway
3.5km (2.2 miles) ⓘGjelleråsen, Nittedal, Akershus, Norway
3.7km (2.3 miles) ⓘBjønndalen Quarry, Nittedal, Akershus, Norway
5.7km (3.5 miles) ⓘSandermosen, Maridalen, Oslomarka, Oslo, Norway
18.0km (11.2 miles) ⓘBallerud, Bærum (Baerum), Akershus, Norway
24.3km (15.1 miles) ⓘRambydalen Quarry, Ullensaker, Akershus, Norway
27.9km (17.3 miles) ⓘFjellsjøen, Lunner, Akershus, Norway
29.8km (18.5 miles) ⓘLake Gjerdingen larvikite outcrop, Jevnaker, Akershus, Norway
32.7km (20.3 miles) ⓘVardåsen Tunnel, Asker, Akershus, Norway
References
Brögger, W. C. (1894) Die Eruptivgesteine des Kristianiagebietes. 1. Die Gesteine der Grorudit-Tinguait-Serie. Videnskabsselskabet i Christiania Skrifter - I Mathematisk-naturvidenskabelig klasse Vol. 1894 (4). In commission by Jacob Dybwad p.1-206.
 
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