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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Gypsum from
Dirt Pot Lead Smelt Mill slag locality, Allendale, Northumberland, England, UK


Locality type:Slag Locality
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Formation:Post-mining/Anthropogenic
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Dirt Pot Lead Smelt Mill slag locality, Allendale, Northumberland, England, UK
Data Identifiers
Mindat Occurrence Record ID:968185
Long-form Identifier:1:3:968185:9
GUID (UUID V4):0
Nearest other occurrences of Gypsum
5.0km (3.1 miles) ⓘCoalcleugh Mine, Coalcleugh, West Allen, Northumberland, England, UK
7.0km (4.4 miles) ⓘSmallcleugh Mine, Nenthead, Alston Moor, Eden, Cumbria, England, UK
7.4km (4.6 miles) ⓘCaplecleugh Mine, Nenthead, Alston Moor, Eden, Cumbria, England, UK
7.5km (4.7 miles) ⓘBrownley Hill Mine (Bloomsberry Horse Level), Nenthead, Alston Moor, Eden, Cumbria, England, UK
8.5km (5.3 miles) ⓘNentsberry Haggs Mine, Nenthead, Alston Moor, Eden, Cumbria, England, UK
12.0km (7.5 miles) ⓘTynebottom Mine, Garrigill, Alston Moor, Eden, Cumbria, England, UK
14.9km (9.3 miles) ⓘWest Pasture Mine, Stanhope, County Durham, England, UK
16.8km (10.4 miles) ⓘBollihope lead smelter slag locality, Stanhope, County Durham, England, UK
17.7km (11.0 miles) ⓘDiana Maria Mine, Rogerley Quarry, Stanhope, County Durham, England, UK
19.9km (12.4 miles) ⓘBollihope Smelt Mill slag locality, Stanhope, County Durham, England, UK
References
Norman Wilson collection
 
and/or  
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