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Ankarinarivo pegmatite, Sahatany Valley, Ibity, Antsirabe II, Vakinankaratra, Madagascari
Regional Level Types
Ankarinarivo pegmatitePegmatite
Sahatany ValleyValley
IbityCommune
Antsirabe IIDistrict
VakinankaratraRegion
MadagascarCountry

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Name in Malagasy:Ankarinarivo, Lohasahan'i Sahatany, Kaominin' Alatsinainy Ibity, Distrikan' Antsirabe II, Vakinankaratra, Madagasikara
Latitude & Longitude (WGS84): 20° 3' 33'' South , 46° 58' 22'' East
Latitude & Longitude (decimal): -20.05944,46.97278
GeoHash:G#: mh3muuk93
Locality type:Pegmatite
Köppen climate type:Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Nearest Settlements:
PlacePopulationDistance
Antsirabe186,253 (2018)22.4km
Betafo29,785 (2018)28.2km
Soanindrariny21,000 (2018)32.5km
Fandriana31,437 (2018)47.0km


A complex type LCT pegmatite worked for gem polychromatic tourmalines, topaz and beryl. It is situated a the southern side of Mt. Tsinjoarivo, in the central part of the Sahatany Pegmatite Field. It was described by A. Lacroix (1922) under the name "Tompohobohitra" or "Tompobohitra" by Guigues (1954).

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate
Antananarivo Province, MadagascarProvince (Abolished)
Sahatany Pegmatite Field (Mt Ibity area), MadagascarPegmatite Field

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


16 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!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Ashanite'
Formula: (Nb,Ta,U,Fe,Mn)4O8
Beryl
Formula: Be3Al2(Si6O18)
'Biotite'
'Columbite-(Fe)-Columbite-(Mn) Series'
Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Goethite
Formula: α-Fe3+O(OH)
Hematite
Formula: Fe2O3
'K Feldspar'
'Lepidolite'
Magnetite
Formula: Fe2+Fe3+2O4
Microcline
Formula: K(AlSi3O8)
Microcline var: Amazonite
Formula: K(AlSi3O8)
'Microlite Group'
Formula: A2-mTa2X6-wZ-n
Monazite-(Ce)
Formula: Ce(PO4)
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
'Psilomelane'
Quartz
Formula: SiO2
Quartz var: Chalcedony
Formula: SiO2
Rutile
Formula: TiO2
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spessartine
Formula: Mn2+3Al2(SiO4)3
Topaz
Formula: Al2(SiO4)(F,OH)2
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Xenotime-(Y)
Formula: Y(PO4)
'Zinnwaldite'
Zircon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
'Microlite Group'4.00.A2-mTa2X6-wZ-n
Quartz4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Rutile4.DB.05TiO2
Group 8 - Phosphates, Arsenates and Vanadates
Monazite-(Ce)8.AD.50Ce(PO4)
Xenotime-(Y)8.AD.35Y(PO4)
Group 9 - Silicates
Beryl9.CJ.05Be3Al2(Si6O18)
Dravite9.CK.05Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Elbaite9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Microcline9.FA.30K(AlSi3O8)
var: Amazonite9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spessartine9.AD.25Mn2+3Al2(SiO4)3
Topaz9.AF.35Al2(SiO4)(F,OH)2
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Ashanite'-(Nb,Ta,U,Fe,Mn)4O8
'Biotite'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'K Feldspar'-
'Lepidolite'-
'Psilomelane'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
'Zinnwaldite'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
A2B2O6(O,OH,F)
'Microlite Group'8.2.2.1A2-mTa2X6-wZ-n
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO4
Monazite-(Ce)38.4.3.1Ce(PO4)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Spessartine51.4.3a.3Mn2+3Al2(SiO4)3
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] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Dravite61.3.1.9Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Elbaite61.3.1.8Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
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 with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Ashanite'-(Nb,Ta,U,Fe,Mn)4O8
'Biotite'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'K Feldspar'-
'Lepidolite'-
Microcline
var: Amazonite
-K(AlSi3O8)
'Psilomelane'-
Quartz
var: Chalcedony
-SiO2
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
Xenotime-(Y)-Y(PO4)
'Zinnwaldite'-

List of minerals for each chemical element

HHydrogen
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
H DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
H TopazAl2(SiO4)(F,OH)2
H Goethiteα-Fe3+O(OH)
LiLithium
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
B DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O MuscoviteKAl2(AlSi3O10)(OH)2
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O SpessartineMn32+Al2(SiO4)3
O DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
O Microcline (var: Amazonite)K(AlSi3O8)
O BerylBe3Al2(Si6O18)
O TopazAl2(SiO4)(F,OH)2
O ZirconZr(SiO4)
O Xenotime-(Y)Y(PO4)
O Monazite-(Ce)Ce(PO4)
O Ashanite(Nb,Ta,U,Fe,Mn)4O8
O MagnetiteFe2+Fe23+O4
O RutileTiO2
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O QuartzSiO2
O Quartz (var: Chalcedony)SiO2
O MicroclineK(AlSi3O8)
FFluorine
F TopazAl2(SiO4)(F,OH)2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Na DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpessartineMn32+Al2(SiO4)3
Al DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Al Microcline (var: Amazonite)K(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al TopazAl2(SiO4)(F,OH)2
Al MicroclineK(AlSi3O8)
SiSilicon
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si SpessartineMn32+Al2(SiO4)3
Si DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Microcline (var: Amazonite)K(AlSi3O8)
Si BerylBe3Al2(Si6O18)
Si TopazAl2(SiO4)(F,OH)2
Si ZirconZr(SiO4)
Si QuartzSiO2
Si Quartz (var: Chalcedony)SiO2
Si MicroclineK(AlSi3O8)
PPhosphorus
P Xenotime-(Y)Y(PO4)
P Monazite-(Ce)Ce(PO4)
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Microcline (var: Amazonite)K(AlSi3O8)
K MicroclineK(AlSi3O8)
TiTitanium
Ti RutileTiO2
MnManganese
Mn SpessartineMn32+Al2(SiO4)3
Mn Ashanite(Nb,Ta,U,Fe,Mn)4O8
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Ashanite(Nb,Ta,U,Fe,Mn)4O8
Fe MagnetiteFe2+Fe23+O4
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
YYttrium
Y Xenotime-(Y)Y(PO4)
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Ashanite(Nb,Ta,U,Fe,Mn)4O8
CeCerium
Ce Monazite-(Ce)Ce(PO4)
TaTantalum
Ta Ashanite(Nb,Ta,U,Fe,Mn)4O8
Ta Microlite GroupA2-mTa2X6-wZ-n
UUranium
U Ashanite(Nb,Ta,U,Fe,Mn)4O8

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

Ectasian - Calymmian
1200 - 1600 Ma



ID: 3184647
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1200 - 1600 Ma)

Lithology: Crystalline metamorphic 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]

Rhyacian
2050 - 2300 Ma



ID: 3310225

Age: Rhyacian (2050 - 2300 Ma)

Lithology: Plutonic and metamorphic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

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)
Rakotoarison, W. (1964) Les pegmatites de la Sahatany. Archive du Service Géologique Madagascar. A 1983, 39 pp.
Ranorosoa, N. (1986) Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar. Thèse de Doctorat de l'Université Paul Sabatier, Toulouse.


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