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Chycornish Carn (?), Cliff outcrops, Botallack, St Just, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 8' 36'' North , 5° 41' 38'' West
Latitude & Longitude (decimal): 50.1433333333, -5.69388888889
UK National Grid Reference:SW361335
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK


In 1822, Carne notes: "About six months ago, a mass of beautiful garnets, of a deep red colour, was found imbedded in the rock [in a footnote: The rock here appears to contain chlorite, as well as hornblende and quartz], not far from low water mark, at the foot of Chycornish Carn, about a quarter of a mile south of Botallack. Some of the crystals are larger than hazel-nuts, and most of them were twenty-four sided. Some specimens of a very superior order were procured, each having from one to two hundred crystals on its face."

There is, however, some debate about the true locality of these specimens, some of which are preserved in the collection of the British Museum of Natural History. Chycornish Carn is an isolated rock in the sea, about 40 yards off Crowns Rock, north-west of the Botallack mine. According to Carne, however, the specimens were recovered from a place located a quarter of a mile in the opposite direction. Whether this is just a simple mistake in the locality description is not known. Comparable specimens were never found again, neither at Chycornish Carn, nor anywhere else in the area around Botallack Mine. On the other hand, Carne's report suggests that the locality was collected out, a fact which still leaves Chycornish Carn as the possible location.

For these reasons, the locality is listed with a question mark. The grid reference is that of Chycornish Carn.

Alderman (1935) characterised specimens of these garnets in the Carne Collection at the University of Cambridge. He mentioned that (Sir) Arthur Russell succeeded in discovering the original spot where these garnets were obtained, and that all the garnet specimens have been removed, save for traces. Russell indicated the location was near the low water mark on the cliffs close to Zawn a Bal, between the Crowns and Wheal Edward. Analysis of the garnets showed them to be unusually rich in the almandine component with 91.33% almandine, 1.69% spessartine, 2.35% pyrope and 4.63% grossular.

Mineral List


1 valid mineral.

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

Silurian-Devonian
358.9 - 443.8 Ma
Silurian-Devonian sedimentary rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Sedimentary rocks

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

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



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References

Carne, J. (1822): On the Mineral Productions and the Geology of the Parish of St. Just. Transactions of the Royal Geological Society of Cornwall 2, 290-358.

Alderman, A.R. (1935): Almandine from Botallack, Cornwall. Mineralogical Magazine, 24, 42-48. [http://www.minersoc.org/pages/Archive-MM/Volume_24/24-148-42.pdf]

 
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