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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Plagioclase from
Tom Thumb Island (Flinders Island), Five Islands Nature Reserve, Camden County, New South Wales, Australia


Locality type:Island
Classification
Species:'Plagioclase' (not an IMA approved species)
Formula:(Na,Ca)[(Si,Al)AlSi2]O8
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Plagioclase data
Locality Data:Click here to view Tom Thumb Island (Flinders Island), Five Islands Nature Reserve, Camden County, New South Wales, Australia
Data Identifiers
Mindat Occurrence Record ID:1262003
Long-form Identifier:1:3:1262003:8
GUID (UUID V4):0
Nearest other occurrences of Plagioclase
3.9km (2.4 miles) ⓘBig Island (Perkins Island; Rabbit Island), Five Islands Nature Reserve, Camden County, New South Wales, Australia
6.2km (3.9 miles) ⓘCringila Quarry (Wollongong City Council Quarry), Cringila, Camden County, New South Wales, Australia
50.2km (31.2 miles) ⓘNarellan meteorite, Camden County, New South Wales, Australia
70.3km (43.7 miles) ⓘProspect Quarry, Prospect Hill, Prospect, Cumberland County, New South Wales, Australia
74.6km (46.3 miles) ⓘPennant Hills Quarry (Dundas Quarry; Sir Thomas Mitchell Reserve), Dundas Valley, Cumberland County, New South Wales, Australia
75.2km (46.7 miles) ⓘYerranderie, Westmoreland County, New South Wales, Australia
References
Chalmers, R.O. (1941) The petrology of the Five Islands, Port Kembla, New South Wales. Records of the Australian Museum 21:1, 27–42.
 
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