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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Heulandite Subgroup from
Campsie Fells, Stirling, Scotland, UK


Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Campsie Fells, Stirling, Scotland, UK
Data Identifiers
Mindat Occurrence Record ID:6233
Long-form Identifier:1:3:6233:6
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
14.2km (8.8 miles) ⓘEarlsburn Reservoir, Touch Muir (Touch Forest), Stirling, Scotland, UK
14.9km (9.3 miles) ⓘOld Kilpatrick, West Dunbartonshire, Scotland, UK
16.3km (10.1 miles) ⓘTouch Muir (Touch Forest), Stirling, Scotland, UK
18.9km (11.7 miles) ⓘTouch Hills, Stirling, Scotland, UK
24.0km (14.9 miles) ⓘPort Glasgow, Inverclyde, Scotland, UK
25.3km (15.7 miles) ⓘBoyleston Quarry, Barrhead, East Renfrewshire, Scotland, UK
30.2km (18.8 miles) ⓘHartfield Moss, Renfrewshire, Scotland, UK
34.8km (21.6 miles) ⓘLoanhead Quarry, Beith, North Ayrshire, Scotland, UK
References
[Specimen in the Natural History Museum, London]
 
and/or  
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