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St Michael's Mount, Mount's Bay District, Cornwall, England, UK
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Detailed Mineral List:
Actinolite
Formula: ☐{Ca2}{(Mg,Fe2+)5}(Si8O22)(OH)2
Reference: Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 148
'Apatite'
Reference: Phillips, W. (1823): An Elementary Introduction to the Knowledge of Mineralogy, 3rd ed. William Phillips (London), 535 pp.; Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 128; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Photo: © Dr. Holger Klapproth. Apatite from St Michael's Mount, Mount's Bay District, Cornwall, England, UK
Arsenopyrite
Formula: FeAsS
Reference: F. Moore and R. A. Howie (1984) Tin-Bearing Sulphides from St Michael's Mount and Cligga Head, Cornwall. Mineralogical Magazine 48:389-396
Beryl
Formula: Be3Al2(Si6O18)
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.; Rudler, F.W. (1905): A Handbook to a Collection of the Minerals of the British Islands, Mostly Selected from the Ludlam Collection. HMSO Publications (London), 241 pp.
Photo: © Ian Jones. Beryl from St Michael's Mount, Mount's Bay District, Cornwall, England, UK
Cassiterite
Formula: SnO2
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Photo: © Chris Popham. Cassiterite from St Michael's Mount, Mount's Bay District, Cornwall, England, UK
Chalcopyrite
Formula: CuFeS2
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Reference: Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
Fluorite
Formula: CaF2
Reference: Phillips, W. (1823): An Elementary Introduction to the Knowledge of Mineralogy, 3rd ed. William Phillips (London), 535 pp.; Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 131; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Galena
Formula: PbS
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
'Garnet'
Formula: X3Z2(SiO4)3
Reference: Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), pp. 108.
Kesterite
Formula: Cu2(Zn,Fe)SnS4
Description: According to Moore and Howie (1984), kesterite is the most abundant tin-bearing sulfide at this locality. Most of the "stannite" previously reported is in fact misidentified kesterite, while true stannite is very rare and was detected in only two of more than 100 samples studied.
Reference: Moore, F., and Howie, R.A. (1984): Mineralogical Magazine 48, 389-396.
Lepidolite
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.; Rudler, F.W. (1905): A Handbook to a Collection of the Minerals of the British Islands, Mostly Selected from the Ludlam Collection. HMSO Publications (London), 241 pp.
Löllingite
Formula: FeAs2
Reference: F. Moore and R. A. Howie (1984) Tin-Bearing Sulphides from St Michael's Mount and Cligga Head, Cornwall. Mineralogical Magazine 48:389-396
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
Orthoclase
Formula: KAlSi3O8
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
'Pinite'
Reference: Phillips, W. (1823): An Elementary Introduction to the Knowledge of Mineralogy, 3rd ed. William Phillips (London), 535 pp.; Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 161; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Quartz
Formula: SiO2
Reference: F. Moore and R. A. Howie (1984) Tin-Bearing Sulphides from St Michael's Mount and Cligga Head, Cornwall. Mineralogical Magazine 48:389-396
Quartz var: Citrine
Reference: [Golley & Williams, 1995 - "Cornish Mineral Reference Manual", 51]
Quartz var: Rock Crystal
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Quartz var: Rose Quartz
Reference: No reference listed
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
Sphalerite
Formula: ZnS
Reference: Forbes, M.D. (1822): Transactions of the Royal Geological Society of Cornwall 2, 366-375.
Stannite
Formula: Cu2(Fe,Zn)SnS4
Description: According to Moore and Howie (1984), stannite is a rare mineral at this locality, which was detected in only two of more than 100 samples studied. In both cases, it formed a narrow rim between kesterite and quartz. Most of the "stannite" previously reported is in fact misidentified kesterite, while the "yellow stannite" reported by some authors proved to be stannoidite.
Reference: Phillips, W. (1823): An Elementary Introduction to the Knowledge of Mineralogy, 3rd ed. William Phillips (London), 535 pp.; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.; Moore, F., and Howie, R.A. (1984): Mineralogical Magazine 48, 389-396.
Stannoidite
Formula: Cu+6Cu2+2(Fe2+,Zn)3Sn2S12
Description: According to Moore and Howie (1984), stannoidite occurs abundantly at this locality. Their results suggest that most of the "yellow stannite" previously reported is in fact stannoidite.
Reference: Moore, F., and Howie, R.A. (1984): Mineralogical Magazine 48, 389-396; Golley, P., and Williams, R. (1995): Cornish Mineral Reference Manual. Endsleigh Publications (Truro), 104 pp.
Photo: © . Stannoidite from St Michael's Mount, Mount's Bay District, Cornwall, England, UK
Stibnite
Formula: Sb2S3
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
Topaz
Formula: Al2(SiO4)(F,OH)2
Reference: Phillips, W. (1823): An Elementary Introduction to the Knowledge of Mineralogy, 3rd ed. William Phillips (London), 535 pp.; Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 156; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Reference: Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.; Rudler, F.W. (1905): A Handbook to a Collection of the Minerals of the British Islands, Mostly Selected from the Ludlam Collection. HMSO Publications (London), 241 pp.
Zippeite
Formula: K3(UO2)4(SO4)2O3(OH) · 3H2O
Reference: Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), pp. 108.


28 entries listed. 21 valid minerals.

References

Forbes, M.D. (1822): On the Geology of St. Michael's Mount. Transactions of the Royal Geological Society of Cornwall 2, 366-375.

Moore, F., and Howie, R.A. (1984): Tin-Bearing Sulphides from St Michael's Mount and Cligga Head, Cornwall. Mineralogical Magazine 48, 389-396.

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