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Vohidahy, Sahatany Valley, Ibity, Antsirabe II, Vakinankaratra, Madagascari
Regional Level Types
VohidahyGroup of Pegmatites
Sahatany ValleyValley
IbityCommune
Antsirabe IIDistrict
VakinankaratraRegion
MadagascarCountry

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Latitude & Longitude (WGS84):
20° South , 46° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~9km
Locality type:
Group of Pegmatites
Other Languages:
Malagasy:
Vohidahy, Lohasahan'i Sahatany, Kaominin' Alatsinainy Ibity, Distrikan' Antsirabe II, Vakinankaratra, Madagasikara


The name Vohidahy covers 6 different LCT pegmatites close to Mount Vohidahy, which at last 3 of them has been worked for polychromatic tourmalines and beryl. The largest and most important is situated in a ravine SE of Mount Vohidahy. A second pegmatite is found on the eastern flank of Mt. Vohidahy, 50 m SW of the first locality. The third is situated in a ravine on the western flank of Mt. Vohidahy, about 350 m NW of the first one. The 3 other pegmatites are found about 400 m N of the first one.

Regions containing this locality

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

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


13 valid minerals.

Detailed Mineral List:

Beryl
Formula: Be3Al2(Si6O18)
Reference: Rakotoarison, W. (1964): Les pegmatites de la Sahatany. Archive du Service Géologique Madagascar. A. 1983, 39p
Columbite-(Mn)
Formula: Mn2+Nb2O6
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. p 353
Fluorapatite var: Mn-bearing Fluorapatite
Formula: (Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. p 353
Goethite
Formula: α-Fe3+O(OH)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Hematite
Formula: Fe2O3
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Ixiolite
Formula: (Ta,Nb,Sn,Fe,Mn)4O8
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
'Lepidolite'
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Microcline
Formula: K(AlSi3O8)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Microcline var: Amazonite
Formula: K(AlSi3O8)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
'Microlite Group'
Formula: A2-mTa2X6-wZ-n
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Rakotoarison, W. (1964): Les pegmatites de la Sahatany. Archive du Service Géologique Madagascar. A. 1983, 39p
Opal
Formula: SiO2 · nH2O
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
'Psilomelane'
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
'Rubellite'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Rakotoarison, W. (1964): Les pegmatites de la Sahatany. Archive du Service Géologique Madagascar. A. 1983, 39p
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
'Tourmaline'
Formula: A(D3)G6(Si6O18)(BO3)3X3Z
Reference: Rakotoarison, W. (1964): Les pegmatites de la Sahatany. Archive du Service Géologique Madagascar. A. 1983, 39p
Zircon
Formula: Zr(SiO4)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Columbite-(Mn)4.DB.35Mn2+Nb2O6
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Ixiolite4.DB.25(Ta,Nb,Sn,Fe,Mn)4O8
'Microlite Group'4.00.A2-mTa2X6-wZ-n
Opal4.DA.10SiO2 · nH2O
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
var: Mn-bearing Fluorapatite8.BN.05(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Group 9 - Silicates
Beryl9.CJ.05Be3Al2(Si6O18)
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
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Lepidolite'-
'Psilomelane'-
'Rubellite'-A(D3)G6(T6O18)(BO3)3X3Z
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Ixiolite8.1.10.1(Ta,Nb,Sn,Fe,Mn)4O8
A2B2O6(O,OH,F)
'Microlite Group'8.2.2.1A2-mTa2X6-wZ-n
AB2O6
Columbite-(Mn)8.3.2.4Mn2+Nb2O6
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
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 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
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 H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Fluorapatite
var: Mn-bearing Fluorapatite
-(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
'Lepidolite'-
Microcline
var: Amazonite
-K(AlSi3O8)
'Psilomelane'-
'Rubellite'-A(D3)G6(T6O18)(BO3)3X3Z
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H OpalSiO2 · nH2O
H Goethiteα-Fe3+O(OH)
LiLithium
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
B RubelliteA(D3)G6(T6O18)(BO3)3X3Z
OOxygen
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
O MuscoviteKAl2(AlSi3O10)(OH)2
O BerylBe3Al2(Si6O18)
O RubelliteA(D3)G6(T6O18)(BO3)3X3Z
O Microcline (var: Amazonite)K(AlSi3O8)
O SpessartineMn32+Al2(SiO4)3
O ZirconZr(SiO4)
O Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
O OpalSiO2 · nH2O
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O Columbite-(Mn)Mn2+Nb2O6
O FluorapatiteCa5(PO4)3F
O MicroclineK(AlSi3O8)
FFluorine
F Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
F FluorapatiteCa5(PO4)3F
NaSodium
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al BerylBe3Al2(Si6O18)
Al Microcline (var: Amazonite)K(AlSi3O8)
Al SpessartineMn32+Al2(SiO4)3
Al MicroclineK(AlSi3O8)
SiSilicon
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si BerylBe3Al2(Si6O18)
Si Microcline (var: Amazonite)K(AlSi3O8)
Si SpessartineMn32+Al2(SiO4)3
Si ZirconZr(SiO4)
Si OpalSiO2 · nH2O
Si MicroclineK(AlSi3O8)
PPhosphorus
P Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
P FluorapatiteCa5(PO4)3F
ClChlorine
Cl Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Microcline (var: Amazonite)K(AlSi3O8)
K MicroclineK(AlSi3O8)
CaCalcium
Ca Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Ca FluorapatiteCa5(PO4)3F
MnManganese
Mn Fluorapatite (var: Mn-bearing Fluorapatite)(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Mn SpessartineMn32+Al2(SiO4)3
Mn Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
Mn Columbite-(Mn)Mn2+Nb2O6
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
Nb Columbite-(Mn)Mn2+Nb2O6
TaTantalum
Ta Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
Ta Microlite GroupA2-mTa2X6-wZ-n

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lacroix, A. (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. 624 pp.
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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