Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

Important Update News

The RRUFF Project is being updated to improve its interface and content. The beta version of the update is accessible to the public at RRUFF.net. New data is only being added to the beta site. Please note that it is in development, and some components are not functional. Existing RRUFF.info links will resolve to the new site after RRUFF.net is officially released.

We are grateful to NASA for the funding of this effort.

The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.

Locality Name:
Saint Helena

mindat Locality ID: 186419
mindat URL: http://www.mindat.org/loc-186419.html

Tectonic Settings:

Total number of sublocalities beneath "Saint Helena": 7
Total number of bottom-level sublocalities: 5

Number of Child Localities: 3
Child Localities:
Ascension Island
Saint Helena Island
Tristan Da Cunha Island

Latitude: 21°24'20"S
Longitude: 10°'16"W
Decimal Degree (lat, lon): -21.405555555556,-10.004444444444

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
	This mineral's age has not yet been recorded.

Amphibole	Analcime	Cancrinite-sodalite	Cerite	Corundum	Eudialyte	Metavoltine	None	Olivine	Pyrochlore
Pyroxene	Quartz	Sapphirine	Sodalite	Spinel	Titanite	Tridymite	Zircon

Aegirine ()*	Aegirine-augite ()*	Aenigmatite ()*	Arfvedsonite ()*	Cryptohalite ()*
Dalyite ()*	Eudialyte ()*	Fayalite ()*	Forsterite ()*	Haüyne ()*
Hematite ()*	Hieratite ()*	Hydrokenoralstonite ()*	Ilmenite ()*	Kaersutite ()*
Leucite ()*	Magnetite ()*	Metavoltine ()*	Monetite ()*	Nepheline ()*
Newberyite ()*	Quartz ()*	Sodalite ()*	Titanite ()*	Vlasovite ()*
Whitlockite ()*	Zircon ()*

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al Ca Cl F Fe H K Mg N Na O P S Si Ti Zr

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Amphibole Analcime Cancrinite-sodalite Cerite Corundum Eudialyte Metavoltine None Olivine Pyrochlore
Pyroxene Quartz Sapphirine Sodalite Spinel Titanite Tridymite Zircon

27 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	4	104516,104517,104518,104520	1022
Aegirine-augite ()*	Pyroxene	(Ca,Na)(Fe³⁺,Mg,Fe²⁺)Si₂O₆	1	104521	286
Aenigmatite ()*	Sapphirine	Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]	2	104516,104518	133
Arfvedsonite ()*	Amphibole	NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂	2	104516,104518	295
Cryptohalite ()*	None	(NH₄)₂SiF₆	1	104520	14
Dalyite ()*	None	K₂ZrSi₆O₁₅	3	104516,104517,104518	15
Eudialyte ()*	Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂	1	104516	182
Fayalite ()*	Olivine	Fe²⁺₂(SiO₄)	1	104516	371
Forsterite ()*	Olivine	Mg₂(SiO₄)	1	104520	1188
Haüyne ()*	Sodalite Cancrinite-sodalite	Na₃Ca(Si₃Al₃)O₁₂(SO₄)	1	104520	158
Hematite ()*	Corundum	Fe₂O₃	1	104515	14640
Hieratite ()*	None	K₂SiF₆	1	104520	7
Hydrokenoralstonite ()*	Pyrochlore	₂Al₂F₆(H₂O)	1	104520	56
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃	1	104520	5433
Kaersutite ()*	Amphibole	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂	1	104520	179
Leucite ()*	Analcime	K(AlSi₂O₆)	1	104520	233
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	2	104520,104521	14899
Metavoltine ()*	Metavoltine	K₂Na₆Fe²⁺Fe³⁺₆O₂(SO₄)₁₂·18H₂O	1	104520	78
Monetite ()*	None	Ca(PO₃OH)	1	104515	21
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)	2	104520,104521	884
Newberyite ()*	None	Mg(PO₃OH)·3H₂O	1	104515	24
Quartz ()*	Quartz	SiO₂	3	104516,104517,104518	61156
Sodalite ()*	Cancrinite-sodalite Sodalite	Na₄(Si₃Al₃)O₁₂Cl	2	104520,104521	444
Titanite ()*	Titanite	CaTi(SiO₄)O	1	104520	4899
Vlasovite ()*	None	Na₂ZrSi₄O₁₁	1	104517	9
Whitlockite ()*	Cerite	Ca₉Mg(PO₃OH)(PO₄)₆	1	104515	104
Zircon ()*	Zircon	Zr(SiO₄)	1	104516	5251

No ages have been assigned to this locality yet.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...