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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
Old Kilpatrick, West Dunbartonshire, Scotland, UK


01160320017271968987002.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
00349250017272007681774.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
03303820017366980587297.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
04702790017272007691980.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
01160320017271968987002.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
09545730017272007581531.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
03303820017366980587297.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
05733550017366980597905.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
01160320017271968987002.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
00349250017272007681774.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
03303820017366980587297.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
00869170017272007713996.jpg
Heulandite Subgroup

Old Kilpatrick, West Dunbartonshire, Scotland, UK
Locality type:Village
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
Associated Minerals Based on Photo Data:
Stilbite Subgroup1
Quartz1
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Old Kilpatrick, West Dunbartonshire, Scotland, UK
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:6219
Long-form Identifier:1:3:6219:0
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
11.6km (7.2 miles) ⓘPort Glasgow, Inverclyde, Scotland, UK
13.5km (8.4 miles) ⓘBoyleston Quarry, Barrhead, East Renfrewshire, Scotland, UK
14.9km (9.3 miles) ⓘCampsie Fells, Stirling, Scotland, UK
16.1km (10.0 miles) ⓘHartfield Moss, Renfrewshire, Scotland, UK
20.2km (12.5 miles) ⓘLoanhead Quarry, Beith, North Ayrshire, Scotland, UK
28.5km (17.7 miles) ⓘEarlsburn Reservoir, Touch Muir (Touch Forest), Stirling, Scotland, UK
30.9km (19.2 miles) ⓘTouch Muir (Touch Forest), Stirling, Scotland, UK
33.5km (20.8 miles) ⓘTouch Hills, Stirling, Scotland, UK
References
[Specimen in the Natural History Museum, London]
 
and/or  
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