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Izalco Volcano, Sonsonate Department, El Salvador

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Latitude & Longitude (WGS84): 13° 48' North , 89° 36' West
Latitude & Longitude (decimal): 13.80000,-89.60000
GeoHash:G#: d42q905qb
Locality type:Volcano
Köppen climate type:Aw : Tropical savanna, wet


The volcano was almost continously active from its birth in 1770 until 1958. Since then only a brief, very small flank eruption in 1966 has interrupted dormancy. Pre-1966 Izalco lavas are vesicular vitrophyric olivine basalts, usually with bytownite phenocrysts and augite.
Many new minerals have been found in the fumaroles and fumarolic sublimates which are unusually rich in vanadine.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals. 8 (TL) - type locality of valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
Albite var: Andesine
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
Anorthite
Formula: Ca(Al2Si2O8)
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
Anorthite var: Bytownite
Formula: (Ca,Na)[Al(Al,Si)Si2O8]
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
Bannermanite (TL)
Formula: (Na,K)0.7V4+0.7V5+5.3O15
Reference: Amer.Min.(1983) 68, 634-641
Blossite (TL)
Formula: α-Cu2(V2O7)
Reference: American Mineralogist (1987) 72, 397-400; HB3 (1997)
Chalcanthite
Formula: CuSO4 · 5H2O
Reference: Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 36
Chalcocyanite
Formula: CuSO4
Reference: Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 36
Euchlorine
Formula: KNaCu3(SO4)3O
Reference: http://www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/fumar.html; Amer.Min.(1985) 70, 193-196
'Fayalite-Forsterite Series'
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
Fingerite (TL)
Formula: Cu11(VO4)6O2
Reference: Amer.Min.(1985) 70, 193-196; HB4 (2000)
Howardevansite (TL)
Formula: NaCuFe2(VO4)3
Reference: Amer.Min.(1988) 73, 181-186
'Hypersthene'
Formula: (Mg,Fe)SiO3
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
'Labradorite'
Formula: (Ca,Na)[Al(Al,Si)Si2O8]
Reference: www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/petro.html a
Lyonsite (TL)
Formula: Cu3Fe4(VO4)6
Description: Fumarolic sublimate.
Reference: Amer.Min.(1987) 72, 1000-1005
Mcbirneyite (TL)
Formula: Cu3(VO4)2
Reference: J. Volc. Geoth. Res. 33(1987), 183; HB4 (2000)
Shcherbinaite
Formula: V5+2O5
Reference: http://www.geo.mtu.edu/volcanoes/central_america/el_salvador/izalco/fumar.html; Amer.Min.(1983) 68, 634-641 ; Hughes, J. M., & Finger, L. W. (1983). The crystal chemistry of shcherbinaite, naturally occurring V 2 O 5. American Mineralogist, 68(11-12), 1220-1222.
Stoiberite (TL)
Formula: Cu5(VO4)2O2
Reference: AM 64 (1979), 941; HB3 (1997); Amer.Min.(1983) 68, 634-641
'Thénardite'
Formula: Na2SO4
Reference: Am Min 70:1-2 pp 193-196; Amer.Min.(1985) 70, 193-196
'UM1980-18-VO:Cu'
Formula: Cu4V2O9
Reference: Hughes, J.M., Birnie, R.W. (1980): Ziesite, β-Cu2V2O7, a new copper vanadate and fumarole temperature indicator. American Mineralogist: 65: 1146-1149
Ziesite (TL)
Formula: β-Cu2(V2O7)
Reference: [Amer.Min.(1980) 65, 1146-1149; MinRec 18:339]; Amer.Min.(1983) 68, 634-641

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Bannermanite (TL)4.HF.05(Na,K)0.7V4+0.7V5+5.3O15
Shcherbinaite4.HE.10V5+2O5
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Chalcanthite7.CB.20CuSO4 · 5H2O
Chalcocyanite7.AB.10CuSO4
Euchlorine7.BC.30KNaCu3(SO4)3O
Thénardite7.AC.25Na2SO4
Group 8 - Phosphates, Arsenates and Vanadates
Blossite (TL)8.FA.05α-Cu2(V2O7)
Fingerite (TL)8.BB.80Cu11(VO4)6O2
Howardevansite (TL)8.AC.05NaCuFe2(VO4)3
Lyonsite (TL)8.AB.40Cu3Fe4(VO4)6
Mcbirneyite (TL)8.AB.35Cu3(VO4)2
Stoiberite (TL)8.BB.75Cu5(VO4)2O2
Ziesite (TL)8.FA.10β-Cu2(V2O7)
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
var: Andesine9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Anorthite9.FA.35Ca(Al2Si2O8)
var: Bytownite9.FA.35(Ca,Na)[Al(Al,Si)Si2O8]
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Labradorite9.FA.35(Ca,Na)[Al(Al,Si)Si2O8]
Unclassified Minerals, Rocks, etc.
Fayalite-Forsterite Series-
Hypersthene-(Mg,Fe)SiO3
UM1980-18-VO:Cu-Cu4V2O9

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
Miscellaneous
Shcherbinaite4.6.1.1V5+2O5
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
A2XO4
'Thénardite'28.2.3.1Na2SO4
AXO4
Chalcocyanite28.3.3.1CuSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Chalcanthite29.6.7.1CuSO4 · 5H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)5(XO4)3Zq
Euchlorine30.3.1.1KNaCu3(SO4)3O
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
(AB)3(XO4)2
Mcbirneyite (TL)38.3.10.1Cu3(VO4)2
Miscellaneous
Blossite (TL)38.5.6.1α-Cu2(V2O7)
Howardevansite (TL)38.5.3.1NaCuFe2(VO4)3
Lyonsite (TL)38.5.2.1Cu3Fe4(VO4)6
Ziesite (TL)38.5.5.2β-Cu2(V2O7)
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)5(XO4)2Zq
Stoiberite (TL)41.4.5.1Cu5(VO4)2O2
Miscellaneous
Fingerite (TL)41.11.3.1Cu11(VO4)6O2
Group 47 - VANADIUM OXYSALTS
Hydrated Normal Vanadium Oxysalts
Bannermanite (TL)47.3.5.1(Na,K)0.7V4+0.7V5+5.3O15
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Rocks, etc.
var: Andesine-(Na,Ca)[Al(Si,Al)Si2O8]
Anorthite-Ca(Al2Si2O8)
var: Bytownite-(Ca,Na)[Al(Al,Si)Si2O8]
'Fayalite-Forsterite Series'-
'Hypersthene'-(Mg,Fe)SiO3
'Labradorite'-(Ca,Na)[Al(Al,Si)Si2O8]
'UM1980-18-VO:Cu'-Cu4V2O9

List of minerals for each chemical element

HHydrogen
H ChalcanthiteCuSO4 · 5H2O
OOxygen
O AlbiteNa(AlSi3O8)
O Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
O AnorthiteCa(Al2Si2O8)
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O Bannermanite(Na,K)0.7V4+0.7V5+5.3O15
O Blossiteα-Cu2(V2O7)
O Anorthite (var: Bytownite)(Ca,Na)[Al(Al,Si)Si2O8]
O ChalcanthiteCuSO4 · 5H2O
O ChalcocyaniteCuSO4
O EuchlorineKNaCu3(SO4)3O
O FingeriteCu11(VO4)6O2
O HowardevansiteNaCuFe2(VO4)3
O Hypersthene(Mg,Fe)SiO3
O Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
O LyonsiteCu3Fe4(VO4)6
O McbirneyiteCu3(VO4)2
O ShcherbinaiteV25+O5
O StoiberiteCu5(VO4)2O2
O ThénarditeNa2SO4
O UM1980-18-VO:CuCu4V2O9
O Ziesiteβ-Cu2(V2O7)
NaSodium
Na AlbiteNa(AlSi3O8)
Na Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Na Bannermanite(Na,K)0.7V4+0.7V5+5.3O15
Na Anorthite (var: Bytownite)(Ca,Na)[Al(Al,Si)Si2O8]
Na EuchlorineKNaCu3(SO4)3O
Na HowardevansiteNaCuFe2(VO4)3
Na Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Na ThénarditeNa2SO4
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Hypersthene(Mg,Fe)SiO3
AlAluminium
Al AlbiteNa(AlSi3O8)
Al Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Al AnorthiteCa(Al2Si2O8)
Al Anorthite (var: Bytownite)(Ca,Na)[Al(Al,Si)Si2O8]
Al Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
SiSilicon
Si AlbiteNa(AlSi3O8)
Si Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Si AnorthiteCa(Al2Si2O8)
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Anorthite (var: Bytownite)(Ca,Na)[Al(Al,Si)Si2O8]
Si Hypersthene(Mg,Fe)SiO3
Si Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
SSulfur
S ChalcanthiteCuSO4 · 5H2O
S ChalcocyaniteCuSO4
S EuchlorineKNaCu3(SO4)3O
S ThénarditeNa2SO4
KPotassium
K Bannermanite(Na,K)0.7V4+0.7V5+5.3O15
K EuchlorineKNaCu3(SO4)3O
CaCalcium
Ca Albite (var: Andesine)(Na,Ca)[Al(Si,Al)Si2O8]
Ca AnorthiteCa(Al2Si2O8)
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca Anorthite (var: Bytownite)(Ca,Na)[Al(Al,Si)Si2O8]
Ca Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
VVanadium
V Bannermanite(Na,K)0.7V4+0.7V5+5.3O15
V Blossiteα-Cu2(V2O7)
V FingeriteCu11(VO4)6O2
V HowardevansiteNaCuFe2(VO4)3
V LyonsiteCu3Fe4(VO4)6
V McbirneyiteCu3(VO4)2
V ShcherbinaiteV25+O5
V StoiberiteCu5(VO4)2O2
V UM1980-18-VO:CuCu4V2O9
V Ziesiteβ-Cu2(V2O7)
FeIron
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe HowardevansiteNaCuFe2(VO4)3
Fe Hypersthene(Mg,Fe)SiO3
Fe LyonsiteCu3Fe4(VO4)6
CuCopper
Cu Blossiteα-Cu2(V2O7)
Cu ChalcanthiteCuSO4 · 5H2O
Cu ChalcocyaniteCuSO4
Cu EuchlorineKNaCu3(SO4)3O
Cu FingeriteCu11(VO4)6O2
Cu HowardevansiteNaCuFe2(VO4)3
Cu LyonsiteCu3Fe4(VO4)6
Cu McbirneyiteCu3(VO4)2
Cu StoiberiteCu5(VO4)2O2
Cu UM1980-18-VO:CuCu4V2O9
Cu Ziesiteβ-Cu2(V2O7)

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

Miocene
5.333 - 23.03 Ma



ID: 3188297
Cenozoic volcanic rocks

Age: Miocene (5.333 - 23.03 Ma)

Lithology: Intermediate-felsic volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Birnie, R.W., Hughes, J.M. (1979) Stoiberite, Cu5V2O10, a new copper vanadate from Izalco volcano, El Salvador, Central America. American Mineralogist, 64, 941-944. http://www.minsocam.org/ammin/AM64/AM64_941.pdf
Birnie, R.W., Hughes, J.M. (1980) Ziesite, β-Cu2(V2O7), a new copper vanadate and fumarole temperature indicator. American Mineralogist, 65, 1146-1149. http://www.minsocam.org/ammin/AM65/AM65_1146.pdf
Hughes, J.M., Finger, L.W. (1980) Bannermanite, a new sodium-potassium vanadate isostructural with β-NaxV6O15. American Mineralogist 68, 634-642. http://www.minsocam.org/ammin/AM68/AM68_634.pdf
Hughes, J.M., Finger, L.W. (1983) The crystal chemistry of shcherbinaite, naturally occurring V2O5. American Mineralogist, 68(11-12), 1220-1222. http://www.minsocam.org/ammin/AM68/AM68_1220.pdf
Hughes, J.M., Hadidiacos, C.G. (1985) Fingerite, Cu11O2(VO4)6, a new vanadium sublimate from Izalco crater, El Salvador: descriptive mineralogy. American Mineralogist, 70, 193-196. http://www.minsocam.org/ammin/AM70/AM70_193.pdf
Robinson, P.D., Hughes, J.M., Malinconico, M.L. (1987) Blossite, α-Cu2[V2O7], a new fumarolic sublimate from Izalco volcano, El Salvador. American Mineralogist, 72, 397-400. http://www.minsocam.org/ammin/AM72/AM72_397.pdf
Hughes, J.M., Starkey, S.J., Malinconico, M.L., Malinconico, L.L. (1987) Lyonsite, Cu32+Fe43+(VO4)63-, a new fumarolic sublimate from Izalco volcano, El Salvador: Descriptive mineralogy and crystal structure. American Mineralogist, 72, 1000-1005. http://www.minsocam.org/ammin/AM72/AM72_1000.pdf
Hughes, J.M., Christian, B.S., Finger, L.W., Malinconico, L.L. (1987) Mcbirneyite, Cu3(VO4)2, a new sublimate mineral from the fumaroles of Izalco Volcano, El Salvador. Journal of Volcanology and Geothermal Research, 33, 183–190.
Hughes, J.M., Drexler, J.W., Campana, C.F., Malinconico, M.L. (1988) Howardevansite, NaCuFe2(VO4)3, a new fumarolic sublimate from Izalco volcano, El Salvador: Descriptive mineralogy and crystal structure. American Mineralogist, 73, 181-186. http://www.minsocam.org/ammin/AM73/AM73_181.pdf

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