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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Corkite from
Mexico Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK


Locality type:Mine
Classification
Species:Corkite
Formula:PbFe33+(PO4)(SO4)(OH)6
Comments:Cooper & Stanley (1990): "From debris near the High level, on a few specimens collected in 1976 as dark brown to almost black, pseudo-cubic (or pseudo-octahedral) crystals to 1.5mm across, scattered on lustrous black goethite in cavities in gossany quartz, associated with small amounts of later, green, pyromorphite (D.R. Middleton, pers. comm.; det. BM(NH): XRD). A further specimen was later confirmed as corkite by XRD and semi-quantitative analysis at the Royal Museum of Scotland (M. Wirth, pers. comm.)."
Habit:pseudo-cubic or pseudo-octahedral crystals up to 1.5mm across
Colour:dark brown to almost black
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Data
Mineral Data:Click here to view Corkite data
Locality Data:Click here to view Mexico Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:3948
Long-form Identifier:1:3:3948:2
GUID (UUID V4):0
Nearest other occurrences of Corkite
0.3km (0.2 miles) ⓘIron Crag, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
0.8km (0.5 miles) ⓘHigher Roughton Gill (Balliway Rigg), Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
5.9km (3.7 miles) ⓘSaddleback upper trial, Mungrisdale, Eden, Cumbria, England, UK
6.5km (4.0 miles) ⓘSaddleback Old Mine, Mungrisdale, Eden, Cumbria, England, UK
90.1km (56.0 miles) ⓘHopeful Vein, Wanlock Dod, Leadhills, South Lanarkshire, Scotland, UK
90.1km (56.0 miles) ⓘBelton Grain vein, Wanlock Dod-Whytes Cleuch, Wanlockhead, Dumfries and Galloway, Scotland, UK
90.1km (56.0 miles) ⓘCove Vein, Whytes Cleuch, Wanlockhead, Dumfries and Galloway, Scotland, UK
90.3km (56.1 miles) ⓘHigh Pirn Mine (Belton Grain Vein and New Vein), Wanlock Dod-Whytes Cleuch, Wanlockhead, Dumfries and Galloway, Scotland, UK
References
Cooper, M. P., Stanley, C. J. (1990) Minerals of the English Lake District - Caldbeck Fells. The Natural History Museum, London.
 
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