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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 outcropsGroup of Outcrops
BotallackVillage
St JustCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
50° 8' 51'' North , 5° 41' 29'' West
Latitude & Longitude (decimal):
50.14750,-5.69139
GeoHash:
G#: gbgvq3pdm
GRN:
N34W03
UK National Grid Reference:
SW363341
Type:
Cliff
Köppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
St Just1,957 (2017)2.7km
Madron626 (2017)9.2km
Penzance19,872 (2017)11.4km
Mousehole697 (2017)13.0km
Marazion1,294 (2017)15.6km
Mindat Locality ID:
1085
Long-form identifier:
mindat:1:2:1085:9
GUID (UUID V4):
b5a14fc2-b261-4c86-b56b-56927cd23099


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."

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity 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 Diagram

Detailed 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).
ⓘ 'Asbestos'
ⓘ 'Asbestos var. Mountain Leather'
ⓘ Asbolane
Formula: (Ni,Co)2-xMn4+(O,OH)4 · nH2O
ⓘ 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
ⓘ '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)
ⓘ 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)
ⓘ Herderite
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
ⓘ Prehnite
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).
ⓘ Quartz
Formula: SiO2
Colour: yellowish (iron-stained)
ⓘ 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:
ⓘ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
ⓘ 'Tourmaline var. Achroite'
Formula: A(D3)G6(T6O18)(BO3)3X3Z

Gallery:

Ca2Fe2+Al2BSi4O15OHⓘ Axinite-(Fe)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
ⓘCassiterite4.DB.05SnO2
ⓘAsbolane4.FL.30(Ni,Co)2-xMn4+(O,OH)4 · nH2O
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘGypsum
var. Selenite ?		7.CD.40CaSO4 · 2H2O
ⓘ ?7.CD.40CaSO4 · 2H2O
ⓘScheelite7.GA.05Ca(WO4)
Group 8 - Phosphates, Arsenates and Vanadates
ⓘHerderite ?8.BA.10CaBe(PO4)F
ⓘErythrite8.CE.40Co3(AsO4)2 · 8H2O
Group 9 - Silicates
ⓘPhenakite9.AA.05Be2SiO4
ⓘAxinite-(Fe)9.BD.20Ca2Fe2+Al2BSi4O15OH
ⓘSchorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘActinolite9.DE.10◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘStokesite (TL)9.DM.05CaSn[Si3O9] · 2H2O
ⓘPrehnite ?9.DP.20Ca2Al2Si3O10(OH)2
Unclassified
ⓘ'K Feldspar
var. Adularia'		-KAlSi3O8
ⓘ'Chlorite Group'-
ⓘ'Tourmaline
var. Achroite'		-A(D3)G6(T6O18)(BO3)3X3Z
ⓘ''-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

HHydrogen
Hⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hⓘ Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
Hⓘ ErythriteCo3(AsO4)2 · 8H2O
Hⓘ Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ PrehniteCa2Al2Si3O10(OH)2
Hⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ StokesiteCaSn[Si3O9] · 2H2O
Hⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Hⓘ ApatiteCa5(PO4)3(Cl/F/OH)
BeBeryllium
Beⓘ HerderiteCaBe(PO4)F
Beⓘ PhenakiteBe2SiO4
BBoron
Bⓘ Tourmaline var. AchroiteA(D3)G6(T6O18)(BO3)3X3Z
Bⓘ Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Bⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
CCarbon
Cⓘ CalciteCaCO3
OOxygen
Oⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oⓘ K Feldspar var. AdulariaKAlSi3O8
Oⓘ Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
Oⓘ Tourmaline var. AchroiteA(D3)G6(T6O18)(BO3)3X3Z
Oⓘ CalciteCaCO3
Oⓘ CassiteriteSnO2
Oⓘ ErythriteCo3(AsO4)2 · 8H2O
Oⓘ Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ HerderiteCaBe(PO4)F
Oⓘ PhenakiteBe2SiO4
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ QuartzSiO2
Oⓘ ScheeliteCa(WO4)
Oⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ StokesiteCaSn[Si3O9] · 2H2O
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
Fⓘ HerderiteCaBe(PO4)F
Fⓘ ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Naⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mgⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
AlAluminium
Alⓘ K Feldspar var. AdulariaKAlSi3O8
Alⓘ Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Alⓘ PrehniteCa2Al2Si3O10(OH)2
Alⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Siⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Siⓘ PhenakiteBe2SiO4
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ QuartzSiO2
Siⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ StokesiteCaSn[Si3O9] · 2H2O
Siⓘ Garnet GroupX3Z2(SiO4)3
PPhosphorus
Pⓘ HerderiteCaBe(PO4)F
Pⓘ ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ Gypsum var. SeleniteCaSO4 · 2H2O
ClChlorine
Clⓘ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ K Feldspar var. AdulariaKAlSi3O8
CaCalcium
Caⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caⓘ CalciteCaCO3
Caⓘ Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ HerderiteCaBe(PO4)F
Caⓘ PrehniteCa2Al2Si3O10(OH)2
Caⓘ ScheeliteCa(WO4)
Caⓘ StokesiteCaSn[Si3O9] · 2H2O
Caⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Caⓘ ApatiteCa5(PO4)3(Cl/F/OH)
MnManganese
Mnⓘ Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
FeIron
Feⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feⓘ Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Feⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
CoCobalt
Coⓘ Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
Coⓘ ErythriteCo3(AsO4)2 · 8H2O
NiNickel
Niⓘ Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
AsArsenic
Asⓘ ErythriteCo3(AsO4)2 · 8H2O
SnTin
Snⓘ CassiteriteSnO2
Snⓘ StokesiteCaSn[Si3O9] · 2H2O
WTungsten
Wⓘ ScheeliteCa(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

Other Regions, Features and Areas containing this locality

British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
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.

References

(In fact, this article reports on a find of phenakite and scheelite from Stamps and Jowl Zawn, at the foot of Roscommon Cliff, under Wheal Cock, but not from Wheal Cock itself.)
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
Russell, Arthur (1920) On the occurrence of Phenacite and Scheelite at Wheal Cock, St. Just, Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society, 19 (88) 19-22 doi:10.1180/minmag.1920.019.88.06
Kingsbury, Arthur W. G. (1958) Two beryllium minerals new to Britain: euclase and herderite. Mineralogical Magazine and Journal of the Mineralogical Society, 31 (240). 815-817 doi:10.1180/minmag.1958.031.240.10referring to Russell, 1920
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