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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Fayalite-Forsterite Series from
Calton Hill Quarry, Blackwell in the Peak, Derbyshire Dales District, Derbyshire, England, UK


Locality type:Quarry
Classification
Species:'Fayalite-Forsterite Series' (not an IMA approved species)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Fayalite-Forsterite Series data
Locality Data:Click here to view Calton Hill Quarry, Blackwell in the Peak, Derbyshire Dales District, Derbyshire, England, UK
Data Identifiers
Mindat Occurrence Record ID:630384
Long-form Identifier:1:3:630384:6
GUID (UUID V4):0
Nearest other occurrences of Fayalite-Forsterite Series
70.6km (43.9 miles) ⓘAppley Bridge meteorite, Wrightington, West Lancashire, Lancashire, England, UK
81.4km (50.6 miles) ⓘBarwell meteorite, Barwell, Hinckley and Bosworth, Leicestershire, England, UK
References
Hamad, S. el D. (1963) The chemistry and mineralogy of the olivine nodules of Calton Hill, Derbyshire. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (261) 483-497 doi:10.1180/minmag.1963.033.261.05
Donaldson, Colin H. (1978) Petrology of the uppermost upper mantle deduced from spinel-lherzolite and harzburgite nodules at Calton Hill, Derbyshire. Contributions to Mineralogy and Petrology, 65 (4) 363-377 doi:10.1007/bf00372284
Ford, T., Sarjeant, A., Smith, M. (1993) The minerals of the Peak district of Derbyshire. UK Journal of Mines and Minerals 13, Rockbottom Publications. 16-55
 
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