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Trevaunance Cove, St Agnes, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 19' 13'' North , 5° 12' 5'' West
Latitude & Longitude (decimal): 50.32028,-5.20139
GeoHash:G#: gbuq38s2y
Locality type:Cove
Köppen climate type:Cfb : Temperate oceanic climate


Note on the mineral list:

Cassiterite pebbles were found on the beach at Trevaunance Cove.

The beach at Trevaunance Cove contains considerable quantities of cassiterite-bearing pebbles, however, these can be challenging to spot and are often distinguished by their higher specific gravity.

Wood tin pebbles can also be found at this locality but are less commonly encountered.

Another form of cassiterite that can be found on the beach is 'Dough Tin'. This is a white colour variant of cassiterite that derives its name from the colour and texture resembling that of uncooked bread dough.

Other minerals can also be found in the pebbles at this locality, these include pyrite, chalcopyrite, and sphalerite. Small amounts of galena have also been found in a recently collected specimen.

The source of these mineralised pebbles is likely to be from two main sources, these being mine waste from cliff top dumps making its way down onto the beach and direct erosion from lodes that crossed the cove.

Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

Trevaunance Cove

Regions containing this locality

Devon and Cornwall metalliferous mining district, England, UK

Mining District - 759 mineral species & varietal names listed

St Agnes Mining District, Cornwall, England, UK

Mining District - 190 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 valid minerals.

Detailed Mineral List:

Cassiterite
Formula: SnO2
Reference: Dale Foster photo & specimen; ;
Cassiterite var: Dough tin
Formula: SnO2
Reference: Paul De Bondt collection
Cassiterite var: Wood Tin
Formula: SnO2
Reference: Dale Foster Collection
Chalcopyrite
Formula: CuFeS2
Reference: Dale Foster Collection
'Enysite'
Reference: Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
Galena
Formula: PbS
Reference: Dale Foster Collection
Pyrite
Formula: FeS2
Reference: Dale Foster Collection
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Jason Evans collection
Sphalerite
Formula: ZnS
Reference: Dale Foster Collection
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Reference: Dale Foster Collection

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
'Cassiterite'4.DB.05SnO2
var: Dough tin4.DB.05SnO2
var: Wood Tin4.DB.05SnO2
Group 9 - Silicates
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Unclassified Minerals, Rocks, etc.
Enysite-
Wolframite-(Fe2+)WO4 to (Mn2+)WO4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX2
Cassiterite4.4.1.5SnO2
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)
Unclassified Minerals, Rocks, etc.
Cassiterite
var: Dough tin
-SnO2
var: Wood Tin-SnO2
'Enysite'-
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals for each chemical element

HHydrogen
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O CassiteriteSnO2
O Cassiterite (var: Dough tin)SnO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
O Cassiterite (var: Wood Tin)SnO2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SSulfur
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
S SphaleriteZnS
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
FeIron
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
SnTin
Sn CassiteriteSnO2
Sn Cassiterite (var: Dough tin)SnO2
Sn Cassiterite (var: Wood Tin)SnO2
WTungsten
W Wolframite(Fe2+)WO4 to (Mn2+)WO4
PbLead
Pb GalenaPbS

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

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Carboniferous
323.2 - 358.9 Ma



ID: 3192903
Paleozoic sedimentary rocks

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Devonian
358.9 - 419.2 Ma



ID: 3135951
Devonian claystone

Age: Devonian (358.9 - 419.2 Ma)

Lithology: Claystone

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Middle Devonian
382.7 - 393.3 Ma



ID: 2035678
Middle Devonian (Undifferentiated)

Age: Middle Devonian (382.7 - 393.3 Ma)

Lithology: Mudstone, siltstone and sandstone

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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