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Hensbarrow China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKi
Regional Level Types
Hensbarrow China Clay PitPit
Stenalees- not defined -
TreverbynCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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Key
Latitude & Longitude (WGS84):
50° 22' 58'' North , 4° 48' 44'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SX001575
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Bugle2,873 (2017)2.0km
Roche2,517 (2017)3.2km
Nanpean2,563 (2017)4.3km
Luxulian388 (2017)4.9km
Saint Dennis2,206 (2016)5.0km


A china clay pit between Gunheath and Goonbarrow. It is marked on older maps but in the early 1980's it was included into the advancing Gunheath. Old specimens occasionally come on the market from this location as collectors in the 1960's and 70's found it easy to access and with an obvious Turquoise vein it was a regular site to visit. Nothing can be seen of this site today.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Commodity List

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


Mineral List


9 valid minerals.

Detailed Mineral List:

Cassiterite
Formula: SnO2
Reference: A.K. Hamilton Jenkin: Annotations to Ordnance Survey map, scale 1:10,000, sheet 41SE; Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.
Fluorite
Formula: CaF2
Reference: Min Rec (1981) 12:349-353
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Min Rec (1981) 12:349-353
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Min Rec (1981) 12:349-353
Quartz
Formula: SiO2
Reference: UK Journal of Mines and Minerals, No. 14 p27; Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Min Rec (1981) 12:349-353; UK Journal of Mines and Minerals, No. 14 p27; Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.
Turquoise
Formula: CuAl6(PO4)4(OH)8 · 4H2O
Reference: [MinRec 12:350-352]; Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.
Variscite
Formula: AlPO4 · 2H2O
Reference: UK Journal of Mines and Minerals, No. 14 p27
Wavellite
Formula: Al3(PO4)2(OH,F)3 · 5H2O
Reference: UK Journal of Mines and Minerals, No. 14 p27; Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Reference: A.K. Hamilton Jenkin: Annotations to Ordnance Survey map, scale 1:10,000, sheet 41SE; Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.
'Zinnwaldite'
Reference: UK Journal of Mines and Minerals, No. 14 p27; Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Cassiterite4.DB.05SnO2
Quartz4.DA.05SiO2
Group 8 - Phosphates, Arsenates and Vanadates
Turquoise8.DD.15CuAl6(PO4)4(OH)8 · 4H2O
Variscite8.CD.10AlPO4 · 2H2O
Wavellite8.DC.50Al3(PO4)2(OH,F)3 · 5H2O
Group 9 - Silicates
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Unclassified Minerals, Rocks, etc.
'Wolframite'-(Fe2+)WO4to (Mn2+)WO4
'Zinnwaldite'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Variscite40.4.1.1AlPO4 · 2H2O
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)7(XO4)4Zq·xH2O
Turquoise42.9.3.1CuAl6(PO4)4(OH)8 · 4H2O
A3(XO4)2Zq·xH2O
Wavellite42.10.2.1Al3(PO4)2(OH,F)3 · 5H2O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Kaolinite-Al2(Si2O5)(OH)4
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4
'Zinnwaldite'-

List of minerals for each chemical element

HHydrogen
H TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
H VarisciteAlPO4 · 2H2O
H WavelliteAl3(PO4)2(OH,F)3 · 5H2O
H KaoliniteAl2(Si2O5)(OH)4
H MuscoviteKAl2(AlSi3O10)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
O VarisciteAlPO4 · 2H2O
O WavelliteAl3(PO4)2(OH,F)3 · 5H2O
O KaoliniteAl2(Si2O5)(OH)4
O MuscoviteKAl2(AlSi3O10)(OH)2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O QuartzSiO2
O CassiteriteSnO2
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
FFluorine
F WavelliteAl3(PO4)2(OH,F)3 · 5H2O
F FluoriteCaF2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
Al VarisciteAlPO4 · 2H2O
Al WavelliteAl3(PO4)2(OH,F)3 · 5H2O
Al KaoliniteAl2(Si2O5)(OH)4
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si KaoliniteAl2(Si2O5)(OH)4
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si QuartzSiO2
PPhosphorus
P TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
P VarisciteAlPO4 · 2H2O
P WavelliteAl3(PO4)2(OH,F)3 · 5H2O
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca FluoriteCaF2
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
CuCopper
Cu TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
SnTin
Sn CassiteriteSnO2
WTungsten
W Wolframite(Fe2+)WO4 to (Mn2+)WO4

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)
Barstow, R.W. (1982): Variscite from Hensbarrow china clay works, St Austell, Cornwall. Mineralogical Magazine 46, 512.
A.K. Hamilton Jenkin: Annotations to Ordnance Survey map, scale 1:10,000, sheet 41SE.

Other Regions, Features and Areas containing this locality

British IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
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.
 
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