Vohidahy, Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar i
Regional Level Types
Vohidahy Group of Pegmatites
Sahatany Valley Valley
Ibity Commune
Antsirabe II District District
Vakinankaratra Region
Madagascar Country

Vohidahy, Sahatany Valley, Sahatany Pegmatite Field (Mt Ibity area), Madagascar

Regional Level Types
Vohidahy	Group of Pegmatites
Sahatany Valley	Valley
Ibity	Commune
Antsirabe II District	District
Vakinankaratra	Region
Madagascar	Country

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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

GRN:

S14E32

Type:

Group of Pegmatites

Köppen climate type:

Cwb : Subtropical highland climate or temperate oceanic climate with dry winters

Mindat Locality ID:

127435

Long-form identifier:

mindat:1:2:127435:9

GUID (UUID V4):

d5f2a94b-5f11-4652-81a2-1a52d45bee2a

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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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

ⓘ Gemstones

Mineral List

12 valid minerals.

Detailed Mineral List:

ⓘ Beryl

Formula: Be₃Al₂(Si₆O₁₈)

References:

Rakotoarison, W. (1964, May) Les pegmatites de la Sahatany. Archive Service Géologique de Madagascar A. 1983. Service Géologique

ⓘ Columbite-(Mn)

Formula: Mn²⁺Nb₂O₆

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Elbaite

Formula: Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Fluorapatite

Formula: Ca₅(PO₄)₃F

References:

Lacroix, Alfred (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. Augustin Challamel, Paris. p.1-624.

ⓘ Fluorapatite var. Manganese-bearing Fluorapatite

Formula: (Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)

References:

Lacroix, Alfred (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. Augustin Challamel, Paris. p.1-624.

ⓘ Goethite

Formula: α-Fe³⁺O(OH)

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Hematite

Formula: Fe₂O₃

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'

Formula: (Ta,Nb,Sn,Fe,Mn)₄O₈

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ 'Lepidolite'

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Microcline

Formula: K(AlSi₃O₈)

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Microcline var. Amazonite

Formula: K(AlSi₃O₈)

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ 'Microlite Group'

Formula: A_2-mTa₂X_6-wZ_-n

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

Rakotoarison, W. (1964, May) Les pegmatites de la Sahatany. Archive Service Géologique de Madagascar A. 1983. Service Géologique

Larsen, Knut Edvard (2003) Mineralene i Sahatany pegmatittfelt, Madagaskar [The minerals of the Sahatany pegmatite field, Madagascar]. Norsk Bergverksmuseum Skrift, 25. 5-18

ⓘ Opal

Formula: SiO₂ · nH₂O

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ 'Psilomelane'

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Schorl

Formula: NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ Spessartine

Formula: Mn²⁺₃Al₂(SiO₄)₃

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

ⓘ 'Tourmaline'

Formula: AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z

References:

Rakotoarison, W. (1964, May) Les pegmatites de la Sahatany. Archive Service Géologique de Madagascar A. 1983. Service Géologique

ⓘ 'Tourmaline var. Rubellite'

Formula: A(D₃)G₆(T₆O₁₈)(BO₃)₃X₃Z

References:

Rakotoarison, W. (1964, May) Les pegmatites de la Sahatany. Archive Service Géologique de Madagascar A. 1983. Service Géologique

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'	4..	(Ta,Nb,Sn,Fe,Mn)₄O₈
ⓘ	Goethite	4.00.	α-Fe³⁺O(OH)
ⓘ	'Microlite Group'	4.00.	A_2-mTa₂X_6-wZ_-n
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Opal	4.DA.10	SiO₂ · nH₂O
ⓘ	Columbite-(Mn)	4.DB.35	Mn²⁺Nb₂O₆
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Fluorapatite	8.BN.05	Ca₅(PO₄)₃F
ⓘ	var. Manganese-bearing Fluorapatite	8.BN.05	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
Group 9 - Silicates
ⓘ	Spessartine	9.AD.25	Mn²⁺₃Al₂(SiO₄)₃
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Beryl	9.CJ.05	Be₃Al₂(Si₆O₁₈)
ⓘ	Schorl	9.CK.05	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
ⓘ	Elbaite	9.CK.05	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Microcline var. Amazonite	9.FA.30	K(AlSi₃O₈)
ⓘ		9.FA.30	K(AlSi₃O₈)
Unclassified
ⓘ	'Tourmaline var. Rubellite'	-	A(D₃)G₆(T₆O₁₈)(BO₃)₃X₃Z
ⓘ	'Psilomelane'	-
ⓘ	'Lepidolite'	-
ⓘ	'Tourmaline'	-	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Elbaite	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
H	ⓘ Goethite	α-Fe³⁺O(OH)
H	ⓘ Fluorapatite var. Manganese-bearing Fluorapatite	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Opal	SiO₂ · nH₂O
H	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Li	Lithium
Li	ⓘ Elbaite	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Be	Beryllium
Be	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
B	Boron
B	ⓘ Elbaite	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
B	ⓘ Tourmaline var. Rubellite	A(D₃)G₆(T₆O₁₈)(BO₃)₃X₃Z
B	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
B	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
O	Oxygen
O	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
O	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
O	ⓘ Elbaite	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
O	ⓘ Fluorapatite	Ca₅(PO₄)₃F
O	ⓘ Goethite	α-Fe³⁺O(OH)
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Columbite-(Mn)	Mn²⁺Nb₂O₆
O	ⓘ Fluorapatite var. Manganese-bearing Fluorapatite	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Opal	SiO₂ · nH₂O
O	ⓘ Tourmaline var. Rubellite	A(D₃)G₆(T₆O₁₈)(BO₃)₃X₃Z
O	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
O	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
O	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
O	ⓘ Zircon	Zr(SiO₄)
F	Fluorine
F	ⓘ Fluorapatite	Ca₅(PO₄)₃F
F	ⓘ Fluorapatite var. Manganese-bearing Fluorapatite	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
Na	Sodium
Na	ⓘ Elbaite	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Na	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	Aluminium
Al	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
Al	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Al	ⓘ Elbaite	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
Si	Silicon
Si	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
Si	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Si	ⓘ Elbaite	Na(Li_1.5Al_1.5)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Opal	SiO₂ · nH₂O
Si	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Si	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
Si	ⓘ Zircon	Zr(SiO₄)
P	Phosphorus
P	ⓘ Fluorapatite	Ca₅(PO₄)₃F
P	ⓘ Fluorapatite var. Manganese-bearing Fluorapatite	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
Cl	Chlorine
Cl	ⓘ Fluorapatite var. Manganese-bearing Fluorapatite	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
K	Potassium
K	ⓘ Microcline var. Amazonite	K(AlSi₃O₈)
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Fluorapatite	Ca₅(PO₄)₃F
Ca	ⓘ Fluorapatite var. Manganese-bearing Fluorapatite	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
Mn	Manganese
Mn	ⓘ Columbite-(Mn)	Mn²⁺Nb₂O₆
Mn	ⓘ Fluorapatite var. Manganese-bearing Fluorapatite	(Ca,Mn²⁺)₅(PO₄)₃(F,Cl,OH) or Ca₅([P,Mn⁵⁺]O₄)₃(F,Cl,OH)
Mn	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
Fe	Iron
Fe	ⓘ Goethite	α-Fe³⁺O(OH)
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Columbite-(Mn)	Mn²⁺Nb₂O₆
Ta	Tantalum
Ta	ⓘ Microlite Group	A_2-mTa₂X_6-wZ_-n

Other Regions, Features and Areas containing this locality

Madagascar

Ankaratra Volcanic RangeVolcanic Range
⭔Antananarivo ProvinceProvince
Sahatany Pegmatite Field (Mt Ibity area)Pegmatite Field

Somali PlateTectonic Plate

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References

Lacroix, Alfred (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. Augustin Challamel, Paris. p.1-624.

Rakotoarison, W. (1964, May) Les pegmatites de la Sahatany. Archive Service Géologique de Madagascar A. 1983. Service Géologique

Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse. Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240

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