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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Prehnite from
Old Potts Gill Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK


Locality type:Mine
Classification
Species:Prehnite
Formula:Ca2Al2Si3O10(OH)2
Comments:Cooper & Stanley (1990): "A specimen of white, botryoidal prehnite labelled Potts Gill is in the Kingsbury Collection (BM(NH)) (Young, 1987). The label is not in Kingsbury's hand and there is no record of the occurrence in any of his unpublished MSS in the BM(NH), nor is this occurrence known to Kingsbury's one-time colleague J. Hartley (pers. comm.)."
Habit:botryoidal
Colour:white
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Prehnite data
Locality Data:Click here to view Old Potts Gill Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:17186
Long-form Identifier:1:3:17186:7
GUID (UUID V4):0
Nearest other occurrences of Prehnite
53.2km (33.1 miles) ⓘCopthill Quarry, Stanhope, County Durham, England, UK
55.9km (34.7 miles) ⓘForce Garth Quarry, Forest and Frith, County Durham, England, UK
91.2km (56.7 miles) ⓘHigh Mark Veins, Craven, North Yorkshire, England, UK
References
Young, B. (1987) Glossary of the minerals of the Lake District and adjoining areas. British Geological Survey, Newcastle upon Tyne. 104pp.
Cooper, M. P., Stanley, C. J. (1990) Minerals of the English Lake District - Caldbeck Fells. The Natural History Museum, London.
 
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