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Itasy Volcanic Field, Miarinarivo, Itasy, Madagascari
Regional Level Types
Itasy Volcanic FieldVolcanic Field
MiarinarivoDistrict
ItasyRegion
MadagascarCountry

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Latitude & Longitude (WGS84):
18° 56' 59'' South , 46° 40' 59'' East
Latitude & Longitude (decimal):
-18.95000,46.68333
GeoHash:
G#: mh9hnq3b0
GRN:
S13E32
Type:
Volcanic Field
Köppen climate type:
Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Mindat Locality ID:
407331
Long-form identifier:
mindat:1:2:407331:7
GUID (UUID V4):
0


Covers some 300 km² and includes numerous domes, scoria cones with summit craters and lava flows and overlies Precambrian granites and gneisses.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


9 valid minerals.

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:

ⓘ Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ Albite var. Andesine
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
ⓘ Albite var. Anorthoclase
Formula: (Na,K)AlSi3O8
ⓘ Albite var. Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
ⓘ Anorthite
Formula: Ca(Al2Si2O8)
ⓘ Anorthite var. Labradorite
Formula: (Ca,Na)[Al(Al,Si)Si2O8]
ⓘ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ Augite var. Titanium-bearing Augite
Formula: (Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
ⓘ 'Fayalite-Forsterite Series'
ⓘ 'Feldspar Group'
ⓘ Haüyne
Formula: Na3Ca(Si3Al3)O12(SO4)
ⓘ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Magnetite var. Titanium-bearing Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
ⓘ 'Microlite Group'
Formula: A2-mTa2X6-wZ-n
ⓘ Nepheline
Formula: Na3K(Al4Si4O16)
ⓘ Nosean
Formula: Na8(Al6Si6O24)(SO4) · H2O
ⓘ 'Pyroxene Group'
Formula: ADSi2O6
ⓘ Quartz
Formula: SiO2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ'Microlite Group'4.00.A2-mTa2X6-wZ-n
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘvar. Titanium-bearing Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
ⓘQuartz4.DA.05SiO2
Group 9 - Silicates
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘvar. Titanium-bearing Augite9.DA.15(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
ⓘAegirine-augite9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘNepheline9.FA.05Na3K(Al4Si4O16)
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘvar. Andesine9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
ⓘAnorthite9.FA.35Ca(Al2Si2O8)
ⓘAlbite
var. Anorthoclase		9.FA.35(Na,K)AlSi3O8
ⓘAnorthite
var. Labradorite		9.FA.35(Ca,Na)[Al(Al,Si)Si2O8]
ⓘAlbite
var. Oligoclase		9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
ⓘHaüyne9.FB.10Na3Ca(Si3Al3)O12(SO4)
ⓘNosean9.FB.10Na8(Al6Si6O24)(SO4) · H2O
Unclassified
ⓘ'Feldspar Group'-
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Hornblende Root Name Group'-◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ'Pyroxene Group'-ADSi2O6
ⓘ'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals for each chemical element

HHydrogen
Hⓘ NoseanNa8(Al6Si6O24)(SO4) · H2O
Hⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Hⓘ ApatiteCa5(PO4)3(Cl/F/OH)
OOxygen
Oⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Oⓘ AnorthiteCa(Al2Si2O8)
Oⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ HaüyneNa3Ca(Si3Al3)O12(SO4)
Oⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ NephelineNa3K(Al4Si4O16)
Oⓘ NoseanNa8(Al6Si6O24)(SO4) · H2O
Oⓘ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Oⓘ QuartzSiO2
Oⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Oⓘ Fayalite-Forsterite Series
Oⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Oⓘ Pyroxene GroupADSi2O6
Oⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Oⓘ ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
Fⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Fⓘ ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Naⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Naⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Naⓘ HaüyneNa3Ca(Si3Al3)O12(SO4)
Naⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Naⓘ NephelineNa3K(Al4Si4O16)
Naⓘ NoseanNa8(Al6Si6O24)(SO4) · H2O
Naⓘ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Naⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
MgMagnesium
Mgⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ Fayalite-Forsterite Series
Mgⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
AlAluminium
Alⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Alⓘ AnorthiteCa(Al2Si2O8)
Alⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Alⓘ HaüyneNa3Ca(Si3Al3)O12(SO4)
Alⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Alⓘ NephelineNa3K(Al4Si4O16)
Alⓘ NoseanNa8(Al6Si6O24)(SO4) · H2O
Alⓘ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Alⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Alⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
SiSilicon
Siⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Siⓘ AnorthiteCa(Al2Si2O8)
Siⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ HaüyneNa3Ca(Si3Al3)O12(SO4)
Siⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Siⓘ NephelineNa3K(Al4Si4O16)
Siⓘ NoseanNa8(Al6Si6O24)(SO4) · H2O
Siⓘ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Siⓘ QuartzSiO2
Siⓘ Fayalite-Forsterite Series
Siⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Siⓘ Pyroxene GroupADSi2O6
Siⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
PPhosphorus
Pⓘ ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
Sⓘ HaüyneNa3Ca(Si3Al3)O12(SO4)
Sⓘ NoseanNa8(Al6Si6O24)(SO4) · H2O
ClChlorine
Clⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Clⓘ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Kⓘ NephelineNa3K(Al4Si4O16)
CaCalcium
Caⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Caⓘ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Caⓘ AnorthiteCa(Al2Si2O8)
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ HaüyneNa3Ca(Si3Al3)O12(SO4)
Caⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Caⓘ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Caⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Caⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Caⓘ ApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
Tiⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Tiⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
FeIron
Feⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Feⓘ Fayalite-Forsterite Series
Feⓘ Augite var. Titanium-bearing Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
TaTantalum
Taⓘ Microlite GroupA2-mTa2X6-wZ-n

Other Regions, Features and Areas containing this locality

AfricaContinent
African Plate
Madagascar
Somali PlateTectonic Plate

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

Lacroix, Alfred (1912) Les volcans du center de Madagascar: le massif d’Itasy [The volcanoes of central Madagascar: the Itasy massif]. Compte Rendus Hebdomadaires des Seances de l'Academie des Sciences 154, 313-317
Lacroix, Alfred (1923) Minéralogie de Madagascar Tome 3 - Lithologie Appendice - Index Geographique. Société d'Éditions Géographiques, Maritimes et Coloniales, Paris. p.1-450.
Lenoble, A. (1940). Études Sur la Géologie de Madagascar. III. Le massif volcanique de l'Itasy. Memoires de l'Academie Malgache, Tananarive, 32, 43-77.
Bussiere, P. (1957) Le massif volcanique de l'Itasy. Travaux du Bureau Gèologique de Madagascar 83, 159-167
Woolley, A. R. (2001) Alkaline Rocks and Carbonatites of the World, Part 3: Africa - Alkaline Rocks and Carbonatites of the World. The Geological Society of London.
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