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The Caerverracks, Kennack Cove (Kennack Sands), Kennack, Grade-Ruan, Cornwall, England, UKi
Regional Level Types
The Caerverracks- not defined -
Kennack Cove (Kennack Sands)Cove
Kennack- not defined -
Grade-RuanCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Key
Latitude & Longitude (WGS84):
50° 0' 22'' North , 5° 9' 36'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Ruan Minor558 (2017)2.1km
Coverack255 (2017)4.9km
Lizard906 (2017)5.3km
Mullion1,955 (2017)6.3km
Gweek667 (2017)10.6km


This is a rocky outcropping that divides the East and West Beaches of Kennack Sands.

The low cliff surrounding the low hill (Carn Kennack) and the rocky reef are composed mainly of meta-Olivenites.

As is usual in this area mineralised veins run through the Bastite Serpentinites.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


4 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and 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:

'Chlorite Group'
Habit: Compact, schistose.
Colour: Various shades of green
Description: Chlorite is common through the fault breccia, occasionally forming pod and lenses. Often mixed with other minerals to produce pale, schistose or earthy masses.
Magnetite
Formula: Fe2+Fe3+2O4
Habit: Granular, massive.
Colour: Black
Description: Found as finely disseminated grains and thread-like networks of veins throughout the Serpentinite rocks. When disseminated, it is sufficient to render the rock generally magnetic. When in veins, the grains between the veins are essentially non-magnetic.
Saponite
Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Habit: Massive
Colour: White
Description: Fractures in the meta-Olivenite (Serpentinite)associated with faulting as well as within the fault breccia are frequently fuilled with white saponite.
Sepiolite ?
Formula: Mg4(Si6O15)(OH)2 · 6H2O
Habit: Massive
Colour: White, off-white to yellowish.
Description: Several masses of compact, white to off-white material have been observed at this location. The masses are relatively resilient and erode to rounded forms. Further investigation is indicated.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Habit: Massive
Colour: Dark red to black.
Description: The rocks comprising this ourtcrop are primarily meta-Olivenites, characterised as bastite Serpentinite rock.
Reference: Alysson Rowan Collection
'Serpentine Subgroup var: Bastite'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Colour: Bronze, dark green, black, red etc.
Description: The rocks of this outcrop are designated as meta-Olivenite, characterised as Bastite Serpentinite rock.
Talc
Formula: Mg3Si4O10(OH)2
Habit: Radial, botyoidal. Also compact to earthy.
Colour: White, pearly. Surfaces discoloured to yellowish when exposed to seawater.
Description: Associated with saponite veins, many voids are filled with radiating masses of crystalline talc. Expansions in the veins occasionally yield an uneven, botryoidal crust of Talc covering an underlying layer of Saponite.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Group 9 - Silicates
Saponite9.EC.45Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Sepiolite ?9.EE.25Mg4(Si6O15)(OH)2 · 6H2O
Talc9.EC.05Mg3Si4O10(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
'var: Bastite'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Talc71.2.1.3Mg3Si4O10(OH)2
Sheets of 6-membered rings with 2:1 clays
Saponite71.3.1b.2Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Sepiolite ?74.3.1b.1Mg4(Si6O15)(OH)2 · 6H2O
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
'var: Bastite'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H TalcMg3Si4O10(OH)2
H SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H SepioliteMg4(Si6O15)(OH)2 · 6H2O
OOxygen
O TalcMg3Si4O10(OH)2
O SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O MagnetiteFe2+Fe23+O4
O SepioliteMg4(Si6O15)(OH)2 · 6H2O
NaSodium
Na SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
MgMagnesium
Mg TalcMg3Si4O10(OH)2
Mg SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg SepioliteMg4(Si6O15)(OH)2 · 6H2O
AlAluminium
Al SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si TalcMg3Si4O10(OH)2
Si SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si SepioliteMg4(Si6O15)(OH)2 · 6H2O
CaCalcium
Ca SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mn Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe MagnetiteFe2+Fe23+O4
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Ni Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Zn Serpentine Subgroup (var: Bastite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

Geochronology

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Floyd, P.A., Exley, C.S. & Styles, M.T. (1993) Igneous Rocks of South-west England, Geological Conservation Review Series, No. 5, Chapman and Hall, London.
Malpas, J. & Langdon, G. S. 1987. The Kennack Gneiss of the Lizard Complex, Cornwall, England: partial melts produced during ophiolite emplacement. Canadian Journal of Earth Sciences 24, 1966–74.
Sandeman, Hamish A. I. (1988) A field, petrographical and geochemical investigation of the Kennack Gneiss, Lizard Peninsula, southwest England. Masters thesis, Memorial University of Newfoundland.
Power, M.R., Shail, R.K., Alexander, A.C., and Scott, P.W. (1997): Alteration and vein mineralisation within the Lizard complex, south Cornwall: constraints on the timing of serpentinisation. Proceedings of the Ussher Society 9, 188-194.

External Links

http://research.library.mun.ca/6823/ = Sandeman, Hamish A. I. (1988) A field, petrographical and geochemical investigation of the Kennack Gneiss, Lizard Peninsula, southwest England. Masters thesis, Memorial University of Newfoundland.

Other Regions, Features and Areas containg this locality

British IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK

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