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
Tobermory, Isle of Mull, Argyll and Bute, 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 Tobermory, Isle of Mull, Argyll and Bute, Scotland, UK
Data Identifiers
Mindat Occurrence Record ID:6220
Long-form Identifier:1:3:6220:6
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
3.3km (2.0 miles) ⓘ'S Airde Beinn, Isle of Mull, Argyll and Bute, Scotland, UK
19.9km (12.4 miles) ⓘCreag Brimishgan, Loch Na Keal, Isle of Mull, Argyll and Bute, Scotland, UK
23.1km (14.4 miles) ⓘMaol nan Damh, Ben More, Isle of Mull, Argyll and Bute, Scotland, UK
33.7km (20.9 miles) ⓘWhitesmith Mine, Strontian, Fort William and Ardnamurchan, Highland, Scotland, UK
65.8km (40.9 miles) ⓘMarble quarries, Kilchrist, Broadford, Isle of Skye, Eilean á Chèo, Highland, Scotland, UK
67.0km (41.7 miles) ⓘSgurr nam Boc, Glen Brittle, Minginish, Isle of Skye, Eilean á Chèo, Highland, Scotland, UK
71.3km (44.3 miles) ⓘEas a Bradain, Luib, Isle of Skye, Eilean á Chèo, Highland, Scotland, UK
76.4km (47.5 miles) ⓘPreshal More, Carbost, Minginish, Isle of Skye, Eilean á Chèo, Highland, Scotland, UK
97.3km (60.4 miles) ⓘA850 road cut, Blackhill, Edinbane, Waternish, Isle of Skye, Eilean á Chèo, Highland, Scotland, UK
97.4km (60.5 miles) ⓘMoonen Bay, Duirinish, Isle of Skye, Eilean á Chèo, Highland, Scotland, UK
References
[Specimen in the Natural History Museum, London]
 
and/or  
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