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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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Mattheddleite from
Brae Fell Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK


Locality type:Mine
Classification
Species:Mattheddleite
Formula:Pb5(SiO4)1.5(SO4)1.5(Cl,OH)
Comments:Cooper & Stanley (1990): "Known from two specimens only: as minute colourless prismatic crystals and drusy pink encrustations on leadhillite and cerussite (King Collection, National Museum of Wales (NMW), det. University of Manchester Institute of Science and Technology (UMIST): IR); and as sharp, prismatic crystals on lanarkite with leadhillite (Kingsbury Collection, BM(NH), det.: XRD)."
Habit:etched prisms and pinkish masses on leadhillite and cerussite; sharp prismatic crystals with typical pyramidal terminations encrusting lanarkite and leadhillite
Colour:colourless, pink
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Infrared Spectroscopy
Data
Mineral Data:Click here to view Mattheddleite data
Locality Data:Click here to view Brae Fell Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:7495
Long-form Identifier:1:3:7495:7
GUID (UUID V4):0
Nearest other occurrences of Mattheddleite
0.3km (0.2 miles) ⓘDry Smale Gill, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
0.9km (0.6 miles) ⓘRed Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
1.3km (0.8 miles) ⓘRoughton Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
1.5km (0.9 miles) ⓘShort Grain, Deer Hills, Caldbeck, Allerdale, Cumbria, England, UK
1.8km (1.1 miles) ⓘThief Gills, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
1.8km (1.1 miles) ⓘHigher Roughton Gill (Balliway Rigg), Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
71.5km (44.4 miles) ⓘBollihope Smelt Mill slag locality, Stanhope, County Durham, England, UK
88.6km (55.0 miles) ⓘHorners Vein (Jeffrey's Vein; Carse's Vein), Leadhills, South Lanarkshire, Scotland, UK
88.8km (55.2 miles) ⓘScar Vein, Wanlock Dod, Leadhills, South Lanarkshire, Scotland, UK
88.8km (55.2 miles) ⓘBelton Grain vein, Wanlock Dod-Whytes Cleuch, Wanlockhead, Dumfries and Galloway, Scotland, UK
References
Cooper, M.P., Green, D.I., Braithwaite, R.S.W. (1988) The occurrence of mattheddleite in the Caldbeck Fells, Cumbria: a preliminary note. UK Journal of Mines and Minerals 5, Rockbottom Publications. 21
Cooper, M. P., Stanley, C. J. (1990) Minerals of the English Lake District - Caldbeck Fells. The Natural History Museum, London.
Stanley, Christopher J., Cooper, Michael P. (1991) Famous Mineral Localities: Pyromorphite-Group Minerals from the Caldbeck Fells, Cumbria, England. The Mineralogical Record, 22 (2) 105-121
Betterton, J. (1996) Mattheddleite: the first Cornish occurrence. UK Journal of Mines and Minerals 16, 15
Wilson, Wendell E. - Ed. (2010) The Lindsay Greenbank Collection: Classic Minerals of Northern England. The Mineralogical Record Vol. 41 (1.1) The Mineralogical Record, Inc.
 
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