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Voronkafotra (Vorokafotra; Vohidava mine), Ianabinda Commune, Betroka District, Anosy Region (Fort Dauphin Region), Tuléar Province (Toliara), Madagascar

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Name(s) in local language(s):Voronkafotra (Vorokafotra), Kaominin' Ianabinda, Distrikan'i Betroka, Faritra Anosy, Faritanin'i Toliary, Madagasikara
Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 23° South , 45° East (est.)
Margin of Error:~29km
Köppen climate type:Cfa : Humid subtropical climate


A classic locality for sapphirine situated close to the Route National nr 13 south of the town Betroka (between Betroka and Ianabinda). A sapphirine bearing rock (sakenite) is exposed in one the old phlogopite mines here (eg. Mahatsinjo mine) located near the village of Voronkafotra.

Phlogopite-bearing pyroxenites were mined for mica in three separate areas, Moraharivo, Mahatsinjo and Besakoa respectively. The concession for the old phlogopite mine was P.E. 229 SAINT-BEZARD (Besaire 1966).
The map coordinates given by Besaire (1966) for the phlogopite deposit is X= 292, Y= 348.

The locality is also referred to in the earlier literature as located about 35 km east of the ancient village of Itrongay in the southern part of Madagascar.
According to Behier (1960), this locality probably is A. Lacroix's sapphirine-locality (Lacroix 1922). Lacroix referred to the locality as being situated some 20s km east of Itrongay. A sapphirine-bearing rock (Sakenite) is described from Mahatsinjo (Besaire 1966).

In more recent times the locality (area) is referred to as Vohidava mine in Razakamanana et al. (2006).
According to Razakamanana et al. (2006), the lithology is a granitic, cordierite-garnet leucogneiss that is intercalated with layers of phlogopite-spinel-diopsidite, clinopyroxene-scapolite and spinel-clinohumite-forsterite-diopside-phlogopite marble and sapphirine-bearing granulites.

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

10 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!

Rock list contains entries from the region specified including sub-localities

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Alphabetical List Tree Diagram

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Besairie, H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34, p.313
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Reference: Razakamanana, T., Ackermand, D. and Windley, B. F. (2006 ): Metamorphic evolution of sapphirine-bearing rocks from Vohidava area, Southern Madagascar: Structural and tectonic implication. Proceedings of the German-Malagasy Research Cooperation in Life and Earth Sciences edited by C Schwitzer, S Brandt et al. p 41-60
Corundum
Formula: Al2O3
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Gélogique Madagascar. A 1871
Diopside
Formula: CaMgSi2O6
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Gélogique Madagascar. A 1871
Enstatite
Formula: MgSiO3
Reference: Razakamanana, T., Ackermand, D. and Windley, B. F. (2006 ): Metamorphic evolution of sapphirine-bearing rocks from Vohidava area, Southern Madagascar: Structural and tectonic implication. Proceedings of the German-Malagasy Research Cooperation in Life and Earth Sciences edited by C Schwitzer, S Brandt et al. p 41-60
'K Feldspar'
Reference: Razakamanana, T., Ackermand, D. and Windley, B. F. (2006 ): Metamorphic evolution of sapphirine-bearing rocks from Vohidava area, Southern Madagascar: Structural and tectonic implication. Proceedings of the German-Malagasy Research Cooperation in Life and Earth Sciences edited by C Schwitzer, S Brandt et al. p 41-60
Kornerupine
Formula: Mg3Al6(Si,Al,B)5O21(OH)
Reference: Behier, J. (1960): Contribution á la mineralogie de Madagascar. Annales Géologiques de Madagascar XXIX, Tananarive. p 46
'commodity:Mica'
Reference:  
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Gélogique Madagascar. A 1871;Besairie, H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34, p.313
'Pyroxenite'
Sapphirine
Formula: Mg4(Mg3Al9)O4[Si3Al9O36]
Reference: Behier, J. (1960): Contribution á la mineralogie de Madagascar. Annales Géologiques de Madagascar XXIX, Tananarive. p 46 ; Razakamanana, T., Ackermand, D. and Windley, B. F. (2006 ): Metamorphic evolution of sapphirine-bearing rocks from Vohidava area, Southern Madagascar: Structural and tectonic implication. Proceedings of the German-Malagasy Research Cooperation in Life and Earth Sciences edited by C Schwitzer, S Brandt et al. p 41-60
Sillimanite
Formula: Al2(SiO4)O
Reference: Razakamanana, T., Ackermand, D. and Windley, B. F. (2006 ): Metamorphic evolution of sapphirine-bearing rocks from Vohidava area, Southern Madagascar: Structural and tectonic implication. Proceedings of the German-Malagasy Research Cooperation in Life and Earth Sciences edited by C Schwitzer, S Brandt et al. p 41-60
Spinel
Formula: MgAl2O4
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Gélogique Madagascar. A 1871; Razakamanana, T., Ackermand, D. and Windley, B. F. (2006 ): Metamorphic evolution of sapphirine-bearing rocks from Vohidava area, Southern Madagascar: Structural and tectonic implication. Proceedings of the German-Malagasy Research Cooperation in Life and Earth Sciences edited by C Schwitzer, S Brandt et al. p 41-60

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Corundum'4.CB.05Al2O3
'Spinel'4.BB.05MgAl2O4
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 9 - Silicates
'Cordierite'9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
'Diopside'9.DA.15CaMgSi2O6
'Enstatite'9.DA.05MgSiO3
'Kornerupine'9.BJ.50Mg3Al6(Si,Al,B)5O21(OH)
'Phlogopite'9.EC.20KMg3(AlSi3O10)(OH)2
'Sapphirine'9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
'Sillimanite'9.AF.05Al2(SiO4)O
Unclassified Minerals, Rocks, etc.
'K Feldspar'-
'Pyroxenite'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Sillimanite52.2.2a.1Al2(SiO4)O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [4] and higher coordination; single and double groups (n=1, 2)
Kornerupine58.1.1.1Mg3Al6(Si,Al,B)5O21(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with Al substituted rings
Cordierite61.2.1.1(Mg,Fe)2Al3(AlSi5O18)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Enstatite65.1.2.1MgSiO3
Group 69 - INOSILICATES Chains with Side Branches or Loops
Chains with Side Branches or Loops with P>2
Sapphirine69.2.1b.1Mg4(Mg3Al9)O4[Si3Al9O36]
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'K Feldspar'-
'Pyroxenite'-

List of minerals for each chemical element

HHydrogen
H KornerupineMg3Al6(Si,Al,B)5O21(OH)
H PhlogopiteKMg3(AlSi3O10)(OH)2
BBoron
B KornerupineMg3Al6(Si,Al,B)5O21(OH)
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O CorundumAl2O3
O DiopsideCaMgSi2O6
O EnstatiteMgSiO3
O KornerupineMg3Al6(Si,Al,B)5O21(OH)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
O SillimaniteAl2(SiO4)O
O SpinelMgAl2O4
MgMagnesium
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mg DiopsideCaMgSi2O6
Mg EnstatiteMgSiO3
Mg KornerupineMg3Al6(Si,Al,B)5O21(OH)
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Mg SpinelMgAl2O4
AlAluminium
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al CorundumAl2O3
Al KornerupineMg3Al6(Si,Al,B)5O21(OH)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Al SillimaniteAl2(SiO4)O
Al SpinelMgAl2O4
SiSilicon
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si DiopsideCaMgSi2O6
Si EnstatiteMgSiO3
Si KornerupineMg3Al6(Si,Al,B)5O21(OH)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Si SillimaniteAl2(SiO4)O
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca DiopsideCaMgSi2O6
FeIron
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lacroix, A. (1922) Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris, 624 p.
Behier, J. (1960) Contribution á la mineralogie de Madagascar. Annales Géologiques de Madagascar XXIX, Tananarive, p. 46 [on kornerupine].
Behier, J. (1963) Carte minéralogique de Madagascar. Archive Service Géologique Madagascar. A 1871.
Besairie, H. (1966) Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34, p. 313 + plance 77.
Razakamanana, T., Ackermand, D., and Windley, B.F. (2006) Metamorphic evolution of sapphirine-bearing rocks from Vohidava area, Southern Madagascar: Structural and tectonic implication. Proceedings of the German-Malagasy Research Cooperation in Life and Earth Sciences edited by C. Schwitzer, S. Brandt et al. p. 41-60.

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