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


Locality type:Quarry
Classification
Species:Harmotome
Formula:Ba2(Si12Al4)O32 · 12H2O
Habit:Cruciform twins up to 4 mm
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Harmotome data
Locality Data:Click here to view Kristiansen Quarry (Bånkall Quarry), Bånkall, Grorud, Oslo, Norway
Data Identifiers
Mindat Occurrence Record ID:293113
Long-form Identifier:1:3:293113:5
GUID (UUID V4):0
Nearest other occurrences of Harmotome
1.9km (1.2 miles) ⓘRomsås, Grorud, Oslo, Norway
2.6km (1.6 miles) ⓘBjønndalen Quarry, Nittedal, Akershus, Norway
4.1km (2.6 miles) ⓘRødtvedt, Grorud, Oslo, Norway
5.5km (3.4 miles) ⓘTonsenplassen, Oslomarka, Oslo, Norway
10.1km (6.3 miles) ⓘSognsvann Quarry, Oslomarka, Oslo, Norway
54.7km (34.0 miles) ⓘBatteriet, Åssiden, Drammen, Buskerud, Norway
62.8km (39.0 miles) ⓘSøndre Kleivan, Holmestrand, Vestfold, Norway
63.1km (39.2 miles) ⓘBjerkeli residental area, Botne, Holmestrand, Vestfold, Norway
76.1km (47.3 miles) ⓘKjennerudvann Copper Mines, Kjennerudvannet North, Øvre Eiker, Buskerud, Norway
76.6km (47.6 miles) ⓘAnna Sophie Mines, Svene, Flesberg, Buskerud, Norway
References
Oftedal, Ivar; Ahlberg, Per; Sæbø, Per Christian (1965) Contributions to the mineralogy of Norway. No. 30. Minerals from nordmarkite druses. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 45 (2). p.171-175.
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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