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Saint Helena

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Area:420 km2
Locality type:Overseas Territory


A British overseas territory in the South Atlantic Ocean.
It comprises three island groups: Saint Helena itself, Ascension Island and Tristan da Cunha.
The islands are of volcanic origin.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

27 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
Aenigmatite
Formula: Na4[Fe2+10Ti2]O4[Si12O36]
'Albite-Anorthite Series'
'Alkali Feldspar'
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Apatite'
'Apatite var: Collophane'
Arfvedsonite
Formula: [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
'Basaltic tuff'
'Biotite'
'Clinopyroxene Subgroup'
Cryptohalite
Formula: (NH4)2[SiF6]
Dalyite (TL)
Formula: K2ZrSi6O15
Reference: Van Tassel, R. [ with a microchemical analysis by Hey, M.H.] (1952): Dalyite, a new potassium zirconium silicate from Ascension Island, Atlantic. Mineralogical Magazine, 29, 850-857. Fleet, S.G. (1965): The crystal structure of dalyite. Zeitschrift für Krystallographie, 121, 349-368.
Eudialyte
Formula: Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Fayalite
Formula: Fe2+2SiO4
'Fayalite-Forsterite Series'
'Feldspar Group'
'Feldspar Group var: Perthite'
Forsterite
Formula: Mg2SiO4
Haüyne
Formula: (Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Hematite
Formula: Fe2O3
Hieratite
Formula: K2[SiF6]
Hydrokenoralstonite
Formula: Na0.5(Al,Mg)2(F,OH)6•H2O
'Hypersthene'
Formula: (Mg,Fe)SiO3
Ilmenite
Formula: Fe2+TiO3
Kaersutite
Formula: {Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Leucite
Formula: K(AlSi2O6)
Magnetite
Formula: Fe2+Fe3+2O4
Magnetite var: Titaniferous Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
Metavoltine
Formula: Na6K2FeFe6(SO4)12O2 · 18H2O
Monetite
Formula: Ca(HPO4)
Nepheline
Formula: Na3K(Al4Si4O16)
Newberyite
Formula: Mg(HPO4) · 3H2O
'Peralkaline alkali-feldspar-granite'
Quartz
Formula: SiO2
Sodalite
Formula: Na8(Al6Si6O24)Cl2
Titanite
Formula: CaTi(SiO4)O
'Trachytic tuff'
Vlasovite
Formula: Na2ZrSi4O11
Whitlockite
Formula: Ca9Mg(PO4)6(HPO4)
Whitlockite var: Martinite (of Kloos)
Formula: Ca3(PO4,CO3OH)2
Zircon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
'Cryptohalite'3.CH.15(NH4)2[SiF6]
'Hieratite'3.CH.15K2[SiF6]
'Hydrokenoralstonite'3.CF.05 Na0.5(Al,Mg)2(F,OH)6•H2O
Group 4 - Oxides and Hydroxides
'Hematite'4.CB.05Fe2O3
'Ilmenite'4.CB.05Fe2+TiO3
'Magnetite'4.BB.05Fe2+Fe3+2O4
var: Titaniferous Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
'Quartz'4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Metavoltine7.DF.35Na6K2FeFe6(SO4)12O2 · 18H2O
Group 8 - Phosphates, Arsenates and Vanadates
Monetite8.AD.10Ca(HPO4)
Newberyite8.CE.10Mg(HPO4) · 3H2O
Whitlockite8.AC.45Ca9Mg(PO4)6(HPO4)
var: Martinite (of Kloos)8.AC.45Ca3(PO4,CO3OH)2
Group 9 - Silicates
'Aegirine'9.DA.25NaFe3+Si2O6
'Aegirine-augite'9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
'Aenigmatite'9.DH.40Na4[Fe2+10Ti2]O4[Si12O36]
'Arfvedsonite'9.DE.25[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
'Dalyite' (TL)9.EA.25K2ZrSi6O15
'Eudialyte'9.CO.10Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
'Fayalite'9.AC.05Fe2+2SiO4
'Forsterite'9.AC.05Mg2SiO4
'Haüyne'9.FB.10(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
'Kaersutite'9.DE.15{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
'Leucite'9.GB.05K(AlSi2O6)
Nepheline9.FA.05Na3K(Al4Si4O16)
'Sodalite'9.FB.10Na8(Al6Si6O24)Cl2
Titanite9.AG.15CaTi(SiO4)O
Vlasovite9.DM.25Na2ZrSi4O11
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Alkali Feldspar'-
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Apatite'-
'var: Collophane'-
'Basaltic tuff'-
'Biotite'-
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
'var: Perthite'-
'Hypersthene'-(Mg,Fe)SiO3
Peralkaline alkali-feldspar-granite-
Trachytic tuff-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 11 - HALIDE COMPLEXES
AmBX6
Cryptohalite11.5.1.2(NH4)2[SiF6]
Hieratite11.5.1.1K2[SiF6]
Aluminofluorides - Isolated Octahedra
Hydrokenoralstonite11.6.12.1 Na0.5(Al,Mg)2(F,OH)6•H2O
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AmBn(XO4)p·xH2O, with (m+n):p < 3:2 and > 1:1
Metavoltine29.4.6.1Na6K2FeFe6(SO4)12O2 · 18H2O
Group 37 - ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
Miscellaneous
Monetite37.1.1.1Ca(HPO4)
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
(AB)3(XO4)2
Whitlockite38.3.4.1Ca9Mg(PO4)6(HPO4)
Group 39 - HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
A[HXO4]·xH2O
Newberyite39.1.6.1Mg(HPO4) · 3H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Fayalite51.3.1.1Fe2+2SiO4
Forsterite51.3.1.2Mg2SiO4
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 64 - CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
Rings with Other Anions and Insular Silicate Groups with mixed ring types
Eudialyte64.1.1.1Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Aegirine65.1.3c.2NaFe3+Si2O6
Aegirine-augite65.1.3b.2(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Kaersutite66.1.3a.18{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Amphiboles - Ca subgroup
Vlasovite66.2.2.1Na2ZrSi4O11
Group 69 - INOSILICATES Chains with Side Branches or Loops
Chains with Side Branches or Loops with P>2
Aenigmatite69.2.1a.1Na4[Fe2+10Ti2]O4[Si12O36]
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-, 6-, and 8-membered rings
Dalyite (TL)72.2.1.1K2ZrSi6O15
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework Feldspathoids and related species
Haüyne76.2.3.3(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Leucite76.2.2.1K(AlSi2O6)
Nepheline76.2.1.2Na3K(Al4Si4O16)
Sodalite76.2.3.1Na8(Al6Si6O24)Cl2
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Alkali Feldspar'-
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Apatite'-
'var: Collophane'-
Arfvedsonite-[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
'Basaltic tuff'-
'Biotite'-
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
'var: Perthite'-
'Hypersthene'-(Mg,Fe)SiO3
Magnetite
var: Titaniferous Magnetite
-Fe2+(Fe3+,Ti)2O4
'Peralkaline alkali-feldspar-granite'-
'Trachytic tuff'-
Whitlockite
var: Martinite (of Kloos)
-Ca3(PO4,CO3OH)2

List of minerals for each chemical element

HHydrogen
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
H Cryptohalite(NH4)2[SiF6]
H EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
H Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O
H Whitlockite (var: Martinite (of Kloos))Ca3(PO4,CO3OH)2
H MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
H MonetiteCa(HPO4)
H NewberyiteMg(HPO4) · 3H2O
H WhitlockiteCa9Mg(PO4)6(HPO4)
CCarbon
C Whitlockite (var: Martinite (of Kloos))Ca3(PO4,CO3OH)2
NNitrogen
N Cryptohalite(NH4)2[SiF6]
OOxygen
O AegirineNaFe3+Si2O6
O Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
O AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
O DalyiteK2ZrSi6O15
O EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
O FayaliteFe22+SiO4
O ForsteriteMg2SiO4
O Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
O HematiteFe2O3
O Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O
O Hypersthene(Mg,Fe)SiO3
O IlmeniteFe2+TiO3
O Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
O LeuciteK(AlSi2O6)
O MagnetiteFe2+Fe23+O4
O Whitlockite (var: Martinite (of Kloos))Ca3(PO4,CO3OH)2
O MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
O MonetiteCa(HPO4)
O NephelineNa3K(Al4Si4O16)
O NewberyiteMg(HPO4) · 3H2O
O QuartzSiO2
O SodaliteNa8(Al6Si6O24)Cl2
O Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
O TitaniteCaTi(SiO4)O
O VlasoviteNa2ZrSi4O11
O WhitlockiteCa9Mg(PO4)6(HPO4)
O ZirconZr(SiO4)
FFluorine
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
F Cryptohalite(NH4)2[SiF6]
F HieratiteK2[SiF6]
F Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O
NaSodium
Na AegirineNaFe3+Si2O6
Na Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Na AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Na Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Na EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Na Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Na Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O
Na Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Na MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
Na NephelineNa3K(Al4Si4O16)
Na SodaliteNa8(Al6Si6O24)Cl2
Na VlasoviteNa2ZrSi4O11
MgMagnesium
Mg Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mg ForsteriteMg2SiO4
Mg Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O
Mg Hypersthene(Mg,Fe)SiO3
Mg Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Mg NewberyiteMg(HPO4) · 3H2O
Mg WhitlockiteCa9Mg(PO4)6(HPO4)
AlAluminium
Al Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Al Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O
Al Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Al LeuciteK(AlSi2O6)
Al NephelineNa3K(Al4Si4O16)
Al SodaliteNa8(Al6Si6O24)Cl2
SiSilicon
Si AegirineNaFe3+Si2O6
Si Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Si AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Si Cryptohalite(NH4)2[SiF6]
Si DalyiteK2ZrSi6O15
Si EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Si FayaliteFe22+SiO4
Si ForsteriteMg2SiO4
Si Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Si HieratiteK2[SiF6]
Si Hypersthene(Mg,Fe)SiO3
Si Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Si LeuciteK(AlSi2O6)
Si NephelineNa3K(Al4Si4O16)
Si QuartzSiO2
Si SodaliteNa8(Al6Si6O24)Cl2
Si TitaniteCaTi(SiO4)O
Si VlasoviteNa2ZrSi4O11
Si ZirconZr(SiO4)
PPhosphorus
P Whitlockite (var: Martinite (of Kloos))Ca3(PO4,CO3OH)2
P MonetiteCa(HPO4)
P NewberyiteMg(HPO4) · 3H2O
P WhitlockiteCa9Mg(PO4)6(HPO4)
SSulfur
S Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
S MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
ClChlorine
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Cl EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Cl Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Cl SodaliteNa8(Al6Si6O24)Cl2
KPotassium
K DalyiteK2ZrSi6O15
K Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
K HieratiteK2[SiF6]
K LeuciteK(AlSi2O6)
K MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
K NephelineNa3K(Al4Si4O16)
CaCalcium
Ca Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Ca EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Ca Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)
Ca Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Ca Whitlockite (var: Martinite (of Kloos))Ca3(PO4,CO3OH)2
Ca MonetiteCa(HPO4)
Ca TitaniteCaTi(SiO4)O
Ca WhitlockiteCa9Mg(PO4)6(HPO4)
TiTitanium
Ti AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti IlmeniteFe2+TiO3
Ti Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Ti Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
Ti TitaniteCaTi(SiO4)O
MnManganese
Mn EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
FeIron
Fe AegirineNaFe3+Si2O6
Fe Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Fe AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Fe Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Fe EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Fe FayaliteFe22+SiO4
Fe HematiteFe2O3
Fe Hypersthene(Mg,Fe)SiO3
Fe IlmeniteFe2+TiO3
Fe MagnetiteFe2+Fe23+O4
Fe MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2O
Fe Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
ZrZirconium
Zr DalyiteK2ZrSi6O15
Zr EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2
Zr VlasoviteNa2ZrSi4O11
Zr ZirconZr(SiO4)

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