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Stamps and Jowl Zawn (Roscommon Cliff), Cliff outcrops, Botallack, St Just, Cornwall, England, UKi
| Regional Level Types | |
|---|---|
| Stamps and Jowl Zawn (Roscommon Cliff) | Cliff |
| Cliff outcrops | Group of Outcrops |
| Botallack | Village |
| St Just | Civil Parish |
| Cornwall | County |
| England | Constituent Country |
| UK | Country |
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Latitude & Longitude (WGS84):
50° 8' 51'' North , 5° 41' 29'' West
Latitude & Longitude (decimal):
UK National Grid Reference:
SW363341
Type:
Köppen climate type:
Stokesite was discovered in 1899 by Hutchinson on a specimen from the Joseph Carne collection, which was labelled as "selenite" on axinite. The single "selenite" crystal, about 10 mm long, was, in fact, the new mineral. The catalogue of the Carne collection described the specimen as coming from Roscommon Cliff. Hutchinson writes: "On a hurried visit to the neighbourhood I was shown axinite in situ in several places on the cliff, especially at "The Crowns", at Botallack Head, and near the bottom of Roscommon Cliff. A comparison of the matrix of stokesite with the axinite specimens from this district leaves no room for doubting that the locality given in the catalogue is correct."
Kingsbury (1958): "A "Zawn" in the St. Just area is a sheer steep-sided chasm in the cliffs formed by the walls of an outcropping mineral-vein, when the vein itself has disintegrated and fallen into the sea."
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
12 valid minerals. 1 (TL) - type locality of valid minerals. 2 erroneous literature entries.
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 DiagramDetailed Mineral List:
| ⓘ Actinolite Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| ⓘ 'Apatite' Formula: Ca5(PO4)3(Cl/F/OH) Description: Reported from slates in Wheal Cock Zawn (Carne, 1822). References: |
| ⓘ 'Asbestos' |
| ⓘ 'Asbestos var. Mountain Leather' |
| ⓘ Asbolane Formula: (Ni,Co)2-xMn4+(O,OH)4 · nH2O References: |
| ⓘ Axinite-(Fe) Formula: Ca2Fe2+Al2BSi4O15OH |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Cassiterite Formula: SnO2 Habit: prismatic, combinations of m{110} with s{111} and z{821}. Some of the crystals are 'forked' twins similar to those from Dolcoath mine. Colour: black |
| ⓘ 'Chlorite Group' Colour: brownish green |
| ⓘ Erythrite Formula: Co3(AsO4)2 · 8H2O References: |
| ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 |
| ⓘ Gypsum ? Formula: CaSO4 · 2H2O Description: Collins (1892) possibly refers to a specimen in the Carne collection, labelled as "selenite on axinite". This "selenite" was later shown to be the new mineral stokesite (Hutchinson, 1900) References: |
| ⓘ Gypsum var. Selenite ? Formula: CaSO4 · 2H2O Description: Collins (1892) possibly refers to a specimen in the Carne collection, labelled as "selenite on axinite". This "selenite" was later shown to be the new mineral stokesite (Hutchinson, 1900) References: |
| ⓘ Formula: CaBe(PO4)F Description: Kingsbury reference. |
| ⓘ 'K Feldspar' |
| ⓘ 'K Feldspar var. Adularia' Formula: KAlSi3O8 |
| ⓘ Phenakite Formula: Be2SiO4 Habit: long-prismatic Colour: opaque white to yellowish (iron-stained), colourless |
| ⓘ Formula: Ca2Al2Si3O10(OH)2 Description: Golley & Williams list prehnite as occurring at Roscommon Cliff, quoting Carne (1822). Russell (1910) however pointed out that Carne refers to the veins in greenstones around Botallack Head (between Crowns Rock and Wheal Cock Zawn) and not to Roscommon Cliff (which adjoins Wheal Cock Zawn on the north). References: |
| ⓘ Quartz Formula: SiO2 Colour: yellowish (iron-stained) References: |
| ⓘ Scheelite Formula: Ca(WO4) Habit: bipyramidal up to 1.5cm. along the vertical axis of the form e {101}, sometimes also show also the basal plane c {001} Colour: brownish yellow to pale wax-yellow, partially translucent |
| ⓘ Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ Stokesite (TL) Formula: CaSn[Si3O9] · 2H2O Type Locality: References: |
| ⓘ 'Tourmaline' Formula: AD3G6(T6O18)(BO3)3X3Z |
| ⓘ 'Tourmaline var. Achroite' Formula: A(D3)G6(T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
| ⓘ | Asbolane | 4.FL.30 | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Gypsum ? | 7.CD.40 | CaSO4 · 2H2O |
| ⓘ | var. Selenite ? | 7.CD.40 | CaSO4 · 2H2O |
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Herderite ? | 8.BA.10 | CaBe(PO4)F |
| ⓘ | Erythrite | 8.CE.40 | Co3(AsO4)2 · 8H2O |
| Group 9 - Silicates | |||
| ⓘ | Phenakite | 9.AA.05 | Be2SiO4 |
| ⓘ | Axinite-(Fe) | 9.BD.20 | Ca2Fe2+Al2BSi4O15OH |
| ⓘ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Actinolite | 9.DE.10 | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| ⓘ | Stokesite (TL) | 9.DM.05 | CaSn[Si3O9] · 2H2O |
| ⓘ | Prehnite ? | 9.DP.20 | Ca2Al2Si3O10(OH)2 |
| Unclassified | |||
| ⓘ | 'K Feldspar var. Adularia' | - | KAlSi3O8 |
| ⓘ | 'Asbestos' | - | |
| ⓘ | 'Tourmaline var. Achroite' | - | A(D3)G6(T6O18)(BO3)3X3Z |
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Tourmaline' | - | AD3G6(T6O18)(BO3)3X3Z |
| ⓘ | 'Asbestos var. Mountain Leather' | - | |
| ⓘ | 'K Feldspar' | - | |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
| ⓘ | 'Apatite' | - | Ca5(PO4)3(Cl/F/OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| H | ⓘ Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| H | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| H | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| H | ⓘ Gypsum | CaSO4 · 2H2O |
| H | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| H | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘ Stokesite | CaSn[Si3O9] · 2H2O |
| H | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| H | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| Be | Beryllium | |
| Be | ⓘ Herderite | CaBe(PO4)F |
| Be | ⓘ Phenakite | Be2SiO4 |
| B | Boron | |
| B | ⓘ Tourmaline var. Achroite | A(D3)G6(T6O18)(BO3)3X3Z |
| B | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| B | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| B | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| O | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| O | ⓘ Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| O | ⓘ Tourmaline var. Achroite | A(D3)G6(T6O18)(BO3)3X3Z |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Cassiterite | SnO2 |
| O | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| O | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| O | ⓘ Gypsum | CaSO4 · 2H2O |
| O | ⓘ Herderite | CaBe(PO4)F |
| O | ⓘ Phenakite | Be2SiO4 |
| O | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Scheelite | Ca(WO4) |
| O | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘ Stokesite | CaSn[Si3O9] · 2H2O |
| O | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| O | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| O | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| F | Fluorine | |
| F | ⓘ Herderite | CaBe(PO4)F |
| F | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| Na | Sodium | |
| Na | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Mg | Magnesium | |
| Mg | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Al | Aluminium | |
| Al | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Al | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Al | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Al | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | Silicon | |
| Si | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Si | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Si | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Si | ⓘ Phenakite | Be2SiO4 |
| Si | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘ Stokesite | CaSn[Si3O9] · 2H2O |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| P | Phosphorus | |
| P | ⓘ Herderite | CaBe(PO4)F |
| P | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| S | Sulfur | |
| S | ⓘ Gypsum | CaSO4 · 2H2O |
| S | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| Cl | Chlorine | |
| Cl | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| K | Potassium | |
| K | ⓘ K Feldspar var. Adularia | KAlSi3O8 |
| Ca | Calcium | |
| Ca | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Ca | ⓘ Gypsum | CaSO4 · 2H2O |
| Ca | ⓘ Herderite | CaBe(PO4)F |
| Ca | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Ca | ⓘ Stokesite | CaSn[Si3O9] · 2H2O |
| Ca | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| Ca | ⓘ Apatite | Ca5(PO4)3(Cl/F/OH) |
| Mn | Manganese | |
| Mn | ⓘ Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| Fe | Iron | |
| Fe | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| Fe | ⓘ Axinite-(Fe) | Ca2Fe2+Al2BSi4O15OH |
| Fe | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Co | Cobalt | |
| Co | ⓘ Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| Co | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| Ni | Nickel | |
| Ni | ⓘ Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| As | Arsenic | |
| As | ⓘ Erythrite | Co3(AsO4)2 · 8H2O |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
| Sn | ⓘ Stokesite | CaSn[Si3O9] · 2H2O |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
Geochronology
| Geologic Time | Rocks, Minerals and Events | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phanerozoic | ||||||||||||||||||||||
| Paleozoic | ||||||||||||||||||||||
| Permian | ||||||||||||||||||||||
| Guadalupian |
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| Cisuralian |
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Other Regions, Features and Areas containing this locality
British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
- Rheno-Hercynian BeltOrogenic Belt
UK
- England
- Cornwall
- St Just Mining DistrictMining District
- ⭔St Just Mining RegionRegion
- Cornwall National LandscapeNational Landscape
- Devon and Cornwall metalliferous mining districtMining District
- Cornwall
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References
Hutchinson, A. (1900) On Stokesite, a new mineral containing tin, from Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society, 12 (57) 274-281 doi:10.1180/minmag.1900.012.57.07
Stamps and Jowl Zawn, Cliff outcrops, Botallack, St Just, Cornwall, England, UK