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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Polyhalite from
Eskdale No. 2 borehole (Aislaby), Aislaby, Scarborough, North Yorkshire, England, UK


Locality type:Borehole
Classification
Species:Polyhalite
Formula:K2Ca2Mg(SO4)4 · 2H2O
Comments:At a depth of 4,500 feet in a boring.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Polyhalite data
Locality Data:Click here to view Eskdale No. 2 borehole (Aislaby), Aislaby, Scarborough, North Yorkshire, England, UK
Data Identifiers
Mindat Occurrence Record ID:464104
Long-form Identifier:1:3:464104:9
GUID (UUID V4):0
Nearest other occurrences of Polyhalite
2.0km (1.2 miles) ⓘEskdale No. 3 borehole (Sleights), Eskdaleside cum Ugglebarnby, Scarborough, North Yorkshire, England, UK
3.3km (2.1 miles) ⓘYork Potash borehole SM2, Eskdaleside cum Ugglebarnby, Scarborough, North Yorkshire, England, UK
4.9km (3.1 miles) ⓘWoodsmith Mine, Sneaton, Scarborough, North Yorkshire, England, UK
6.0km (3.7 miles) ⓘYork Potash borehole SM3, Sneaton, Scarborough, North Yorkshire, England, UK
6.9km (4.3 miles) ⓘYork Potash borehole SM6, Sneaton, Scarborough, North Yorkshire, England, UK
7.7km (4.8 miles) ⓘYork Potash borehole SM1, Hawsker-cum-Stainsacre, Scarborough, North Yorkshire, England, UK
12.1km (7.5 miles) ⓘYork Potash borehole SM4, LCPs of Fylingdales and Hawsker-cum-Stainsacre, Scarborough, North Yorkshire, England, UK
13.6km (8.4 miles) ⓘBoulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK
38.3km (23.8 miles) ⓘFordon, Wold Newton, East Riding of Yorkshire, England, UK
96.9km (60.2 miles) ⓘRough Gas Field, North Sea
References
Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.p.460
 
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