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Dean Quarry, St Keverne, Cornwall, England, UKi
Regional Level Types
Dean QuarryQuarry (Inactive)
St KeverneCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Latitude & Longitude (WGS84):
50° 2' 32'' North , 5° 4' 7'' West
Latitude & Longitude (decimal):
50.04248,-5.06882
GeoHash:
G#: gbukstuyx
GRN:
N34W03
UK National Grid Reference:
SW803204
Type:
Quarry (Inactive) - last checked 2020
KΓΆppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Coverack255 (2017)2.8km
Ruan Minor558 (2017)9.8km
Constantine819 (2017)11.4km
Gweek667 (2017)11.5km
Falmouth31,988 (2017)12.4km
Mindat Locality ID:
1312
Long-form identifier:
mindat:1:2:1312:6
GUID (UUID V4):
31d9bc56-6a0a-4742-b286-7962e6832cf5


Located about 1.5 km SE of St Keverne, Dean quarry is adjacent to Dean Point on the east coast of the Lizard Peninsula and is developed in a large intrusion of gabbro that extends from Coverack to St Keverne and from Manacle Point to Trelan. The gabbro, which varies in texture from schistose to pegmatitic (pyroxenes to 25 cm), was described in detail in J. S. Flett (1946) Geology of the Lizard and Meneage (BGS Memoir).

A.F. Seager (1969) wrote that he had visited the quarry for 15 years without finding anything of unusual mineralogical interest, but on a visit in 1967 found zeolites lining vughs in the altered dolerite. Since then the quarry has been a notable Cornish locality for crystallised analcime, natrolite, stilbite, prehnite and calcite in particular.

Worked commercially up until 2005, more recently (2018) a proposal was made to develop the site into a mega-quarry. Five million tonnes of rock would be extracted which would be shipped to Swansea Bay in Wales to create 6.5 miles of breakwaters for an artificial lagoon that would generate electricity from the changing tides. This met with significant opposition from the local community in Cornwall, and later the UK Government formally turned down the bid to build the Β£1.3 billion lagoon on economic grounds.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


20 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Analcime
Formula: Na(AlSi2O6) · H2O
β“˜ Anorthite
Formula: Ca(Al2Si2O8)
β“˜ Anorthite var. Labradorite
Formula: (Ca,Na)[Al(Al,Si)Si2O8]
β“˜ Calcite
Formula: CaCO3
β“˜ 'Chabazite'
β“˜ Djurleite
Formula: Cu31S16
β“˜ Enstatite
Formula: Mg2Si2O6
β“˜ Galena
Formula: PbS
β“˜ 'Gmelinite Subgroup'
β“˜ Gyrolite
Formula: NaCa16Si23AlO60(OH)8 · 14H2O
β“˜ 'Heulandite Subgroup'
Formula: (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
β“˜ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
β“˜ 'Kerolite'
Formula: (Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1)
β“˜ 'K Feldspar' ?
References:
P Haas collection
β“˜ 'K Feldspar var. Adularia' ?
Formula: KAlSi3O8
References:
P Haas collection
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
β“˜ Marcasite
Formula: FeS2
β“˜ Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
β“˜ Mottramite
Formula: PbCu(VO4)(OH)
β“˜ Natrolite
Formula: Na2Al2Si3O10 · 2H2O
β“˜ Orthoclase
Formula: K(AlSi3O8)
β“˜ Pectolite
Formula: NaCa2Si3O8(OH)
β“˜ Prehnite
Formula: Ca2Al2Si3O10(OH)2
β“˜ Quartz
Formula: SiO2
β“˜ Scolecite
Formula: CaAl2Si3O10 · 3H2O
Description: Wilson et al. (2008): "No XRD was carried out on this sample but calcium was shown to be present by chemical testing. The sample is in Plymouth Museum. Mindat, and Golley and Williams (1995), list scolecite at Dean Quarry but without a defining reference."
β“˜ Stevensite
Formula: (Ca,Na)xMg3-x(Si4O10)(OH)2
β“˜ Stilbite-Ca
Formula: NaCa4(Si27Al9)O72 · 28H2O
β“˜ 'Stilbite Subgroup'
Formula: M6-7[Al8-9Si27-28O72] · nH2O
β“˜ Volborthite ?
Formula: Cu3(V2O7)(OH)2 · 2H2O
Description: A mineral which is almost certainly volborthite occurs as minute yellow to yellow green spherules (up to about 0.3 mm across) in fractures in the rock. Insufficient material was available for analysis by XRD, but EDS produced a trace which is typical of volborthite. Identification can only be tentative without a confirmatory analysis by XRD, but the data is included in the hope that a detailed examination of further specimens will reveal sufficient material.

Gallery:

Na(AlSi2O6) · H2Oβ“˜ Analcime
CaCO3β“˜ Calcite
Na2Al2Si3O10 · 2H2Oβ“˜ Natrolite
Ca2Al2Si3O10(OH)2β“˜ Prehnite
M6-7[Al8-9Si27-28O72] · nH2Oβ“˜ 'Stilbite Subgroup'

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Djurleite2.BA.05Cu31S16
β“˜Galena2.CD.10PbS
β“˜Marcasite2.EB.10aFeS2
Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
Group 8 - Phosphates, Arsenates and Vanadates
β“˜Mottramite8.BH.40PbCu(VO4)(OH)
β“˜Volborthite ?8.FD.05Cu3(V2O7)(OH)2 Β· 2H2O
Group 9 - Silicates
β“˜Enstatite9.DA.05Mg2Si2O6
β“˜Pectolite9.DG.05NaCa2Si3O8(OH)
β“˜Prehnite9.DP.20Ca2Al2Si3O10(OH)2
β“˜Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 Β· nH2O
β“˜Stevensite9.EC.45(Ca,Na)xMg3-x(Si4O10)(OH)2
β“˜Gyrolite9.EE.30NaCa16Si23AlO60(OH)8 Β· 14H2O
β“˜Orthoclase9.FA.30K(AlSi3O8)
β“˜Anorthite9.FA.35Ca(Al2Si2O8)
β“˜var. Labradorite9.FA.35(Ca,Na)[Al(Al,Si)Si2O8]
β“˜Natrolite9.GA.05Na2Al2Si3O10 Β· 2H2O
β“˜Scolecite9.GA.05CaAl2Si3O10 Β· 3H2O
β“˜Analcime9.GB.05Na(AlSi2O6) Β· H2O
β“˜Stilbite-Ca9.GE.10NaCa4(Si27Al9)O72 Β· 28H2O
Unclassified
β“˜'Kerolite'-(Mg,Ni)3Si4O10(OH)2 Β· nH2O (n ~ 1)
β“˜'Hornblende Root Name Group'-β—»Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
β“˜'K Feldspar
var. Adularia' ?		-KAlSi3O8
β“˜'Stilbite Subgroup'-M6-7[Al8-9Si27-28O72] Β· nH2O
β“˜'Heulandite Subgroup'-(Na/Ca/K)5-6[Al8-9 Si27-28 O72] Β· nH2O
β“˜'Gmelinite Subgroup'-
β“˜'Chabazite'-
β“˜'K Feldspar' ?-

List of minerals for each chemical element

HHydrogen
Hβ“˜ AnalcimeNa(AlSi2O6) · H2O
Hβ“˜ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Hβ“˜ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Hβ“˜ MottramitePbCu(VO4)(OH)
Hβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Hβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Hβ“˜ PectoliteNaCa2Si3O8(OH)
Hβ“˜ PrehniteCa2Al2Si3O10(OH)2
Hβ“˜ ScoleciteCaAl2Si3O10 · 3H2O
Hβ“˜ Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
Hβ“˜ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Hβ“˜ VolborthiteCu3(V2O7)(OH)2 · 2H2O
Hβ“˜ Kerolite(Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1)
Hβ“˜ Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
Hβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
CCarbon
Cβ“˜ CalciteCaCO3
OOxygen
Oβ“˜ K Feldspar var. AdulariaKAlSi3O8
Oβ“˜ AnalcimeNa(AlSi2O6) · H2O
Oβ“˜ AnorthiteCa(Al2Si2O8)
Oβ“˜ CalciteCaCO3
Oβ“˜ EnstatiteMg2Si2O6
Oβ“˜ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Oβ“˜ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Oβ“˜ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ MottramitePbCu(VO4)(OH)
Oβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Oβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Oβ“˜ OrthoclaseK(AlSi3O8)
Oβ“˜ PectoliteNaCa2Si3O8(OH)
Oβ“˜ PrehniteCa2Al2Si3O10(OH)2
Oβ“˜ QuartzSiO2
Oβ“˜ ScoleciteCaAl2Si3O10 · 3H2O
Oβ“˜ Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
Oβ“˜ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Oβ“˜ VolborthiteCu3(V2O7)(OH)2 · 2H2O
Oβ“˜ Kerolite(Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1)
Oβ“˜ Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
Oβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
FFluorine
Fβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
NaSodium
Naβ“˜ AnalcimeNa(AlSi2O6) · H2O
Naβ“˜ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Naβ“˜ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Naβ“˜ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Naβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Naβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Naβ“˜ PectoliteNaCa2Si3O8(OH)
Naβ“˜ Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
Naβ“˜ Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
MgMagnesium
Mgβ“˜ EnstatiteMg2Si2O6
Mgβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Mgβ“˜ Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
Mgβ“˜ Kerolite(Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1)
AlAluminium
Alβ“˜ K Feldspar var. AdulariaKAlSi3O8
Alβ“˜ AnalcimeNa(AlSi2O6) · H2O
Alβ“˜ AnorthiteCa(Al2Si2O8)
Alβ“˜ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Alβ“˜ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Alβ“˜ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Alβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Alβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Alβ“˜ OrthoclaseK(AlSi3O8)
Alβ“˜ PrehniteCa2Al2Si3O10(OH)2
Alβ“˜ ScoleciteCaAl2Si3O10 · 3H2O
Alβ“˜ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Alβ“˜ Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
Alβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
SiSilicon
Siβ“˜ K Feldspar var. AdulariaKAlSi3O8
Siβ“˜ AnalcimeNa(AlSi2O6) · H2O
Siβ“˜ AnorthiteCa(Al2Si2O8)
Siβ“˜ EnstatiteMg2Si2O6
Siβ“˜ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Siβ“˜ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Siβ“˜ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Siβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Siβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Siβ“˜ OrthoclaseK(AlSi3O8)
Siβ“˜ PectoliteNaCa2Si3O8(OH)
Siβ“˜ PrehniteCa2Al2Si3O10(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ ScoleciteCaAl2Si3O10 · 3H2O
Siβ“˜ Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
Siβ“˜ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Siβ“˜ Kerolite(Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1)
Siβ“˜ Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
Siβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
SSulfur
Sβ“˜ DjurleiteCu31S16
Sβ“˜ GalenaPbS
Sβ“˜ MarcasiteFeS2
ClChlorine
Clβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
KPotassium
Kβ“˜ K Feldspar var. AdulariaKAlSi3O8
Kβ“˜ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Kβ“˜ OrthoclaseK(AlSi3O8)
CaCalcium
Caβ“˜ AnorthiteCa(Al2Si2O8)
Caβ“˜ CalciteCaCO3
Caβ“˜ GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
Caβ“˜ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Caβ“˜ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Caβ“˜ Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Caβ“˜ PectoliteNaCa2Si3O8(OH)
Caβ“˜ PrehniteCa2Al2Si3O10(OH)2
Caβ“˜ ScoleciteCaAl2Si3O10 · 3H2O
Caβ“˜ Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
Caβ“˜ Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
Caβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
VVanadium
Vβ“˜ MottramitePbCu(VO4)(OH)
Vβ“˜ VolborthiteCu3(V2O7)(OH)2 · 2H2O
FeIron
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ MarcasiteFeS2
NiNickel
Niβ“˜ Kerolite(Mg,Ni)3Si4O10(OH)2 · nH2O (n ~ 1)
CuCopper
Cuβ“˜ DjurleiteCu31S16
Cuβ“˜ MottramitePbCu(VO4)(OH)
Cuβ“˜ VolborthiteCu3(V2O7)(OH)2 · 2H2O
PbLead
Pbβ“˜ GalenaPbS
Pbβ“˜ MottramitePbCu(VO4)(OH)

Geochronology

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Paleozoic
  Permian
   Guadalupian
β“˜ Major polymetallic mineralization~270 MaCornwall, England, UK
   Cisuralian
β“˜ Porphyry dikes intruded (latest age)~275 MaCornwall, England, UK
β“˜ Greisenization (latest age)~280 MaCornwall, England, UK
β“˜ Porphyry dikes intruded (earliest age)~280 MaCornwall, England, UK
β“˜ Formation of metallized pegmatites~285 MaCornwall, England, UK
β“˜ Greisenization (earliest age)~285 MaCornwall, England, UK
β“˜ Emplacement of major plutons~295 MaCornwall, England, UK

Other Regions, Features and Areas containing this locality

British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
UK

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Seager, A.F. (1969) Zeolites and other minerals from Dean quarry, the Lizard, Cornwall. Mineralogical Magazine, Vol. 37, pg. 147-148
Elton, N. J., Hooper, J. J., Holyer, V. A. D. (1998) Al-free gyrolite from the Lizard, Cornwall, England. Mineralogical Magazine, 62 (2) 271-272 doi:10.1180/002646198547521
Green, D.I., Hubbard, N., and Ince, F. (2008) A review of the occurrences of the copper vanadate minerals volborthite and tangeite in the British Isles. Journal of the Russell Society: 11: 54-58.
Wilson, O., Dyer, A., Holyer, V., Williams, C. (2008) Scolecite from Cornwall, the first occurrences in England. Journal of the Russell Society, 11. 87
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