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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Opal from
Kristiansen Quarry (Bånkall Quarry), Bånkall, Grorud, Oslo, Norway


Locality type:Quarry
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Kristiansen Quarry (Bånkall Quarry), Bånkall, Grorud, Oslo, Norway
Data Identifiers
Mindat Occurrence Record ID:293115
Long-form Identifier:1:3:293115:9
GUID (UUID V4):0
Nearest other occurrences of Opal
1.0km (0.6 miles) ⓘGjelleråsen, Nittedal, Akershus, Norway
2.5km (1.6 miles) ⓘHuken Quarry, Grorud, Oslo, Norway
2.6km (1.6 miles) ⓘBjønndalen Quarry, Nittedal, Akershus, Norway
16.2km (10.1 miles) ⓘDelebekken Quarry, Nittedal, Akershus, Norway
27.0km (16.8 miles) ⓘGjerdingselva, Lunner, Akershus, Norway
34.2km (21.2 miles) ⓘMidtmoen, Øståsen, Lunner, Akershus, Norway
35.1km (21.8 miles) ⓘVardåsen Tunnel, Asker, Akershus, Norway
35.1km (21.8 miles) ⓘHeggedalsveien, Asker, Akershus, Norway
39.0km (24.2 miles) ⓘLierskogen Quarry, Lierskogen, Lier, Buskerud, Norway
47.3km (29.4 miles) ⓘSauesetra, Lier, Buskerud, Norway
References
Kvamsdal, Lars O. (1998) Mineralene fra Nordmarkitt og Grefsensyenitt i Oslofeltet [The minerals from the nordmarkite and grefsensyenites in the Oslo region area]. Privat publication, AS Merkur-Trykk, Oslo. p.1-72.
 
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