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
Rambydalen Quarry, Ullensaker, Akershus, 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 Rambydalen Quarry, Ullensaker, Akershus, Norway
Data Identifiers
Mindat Occurrence Record ID:703202
Long-form Identifier:1:3:703202:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
20.8km (12.9 miles) ⓘBjønndalen Quarry, Nittedal, Akershus, Norway
21.0km (13.1 miles) ⓘGjelleråsen, Nittedal, Akershus, Norway
22.1km (13.7 miles) ⓘKristiansen Quarry (Bånkall Quarry), Bånkall, Grorud, Oslo, Norway
24.3km (15.1 miles) ⓘHuken Quarry, Grorud, Oslo, Norway
24.5km (15.2 miles) ⓘSandermosen, Maridalen, Oslomarka, Oslo, Norway
27.6km (17.1 miles) ⓘTonsenplassen, Oslomarka, Oslo, Norway
27.7km (17.2 miles) ⓘMidtmoen, Øståsen, Lunner, Akershus, Norway
32.2km (20.0 miles) ⓘFjellsjøen, Lunner, Akershus, Norway
36.1km (22.5 miles) ⓘLake Gjerdingen larvikite outcrop, Jevnaker, Akershus, Norway
41.5km (25.8 miles) ⓘNordli molybdenum deposit, Hurdal, Akershus, Norway
References
Karstensen, Terje (2009) Nytt funnsted i Ullensaker. STEIN. Magasin for populærgeologi, 36 (3) 34-37
 
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