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Ianakafy (Inanakafy), Ianakafy Commune, Betroka District, Anosy Region (Fort Dauphin Region), Tuléar Province (Toliara), Madagascar

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 23° South , 45° East (est.)
Margin of Error:~87km
Köppen climate type:Cfa : Humid subtropical climate
Name(s) in local language(s):Ianakafy, Kaominina Ianakafy, Distrikan'i Betroka, Faritra Anosy, Faritanin'i Toliary, Madagasikara


von Knorring, Sahama & Lehtinen (1969) published data on kornerupine found in 2 samples of a highly metamorphic gneiss said to come from "Inanakafy near Betroka, Madagascar". "Inanakafy" is most probably a misspelling and refers to the small village and commune center Ianakafy situated about 90 km along a dirt road West of Betroka.

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Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 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:

'Albite-Anorthite Series'
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Habit: oval-shaped monomineralic aggregates
Colour: slightly bluish
Description: a very Mg-rich variety with ca. 7 mol. % of the iron component
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
'Gneiss'
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
Kornerupine
Formula: Mg3Al6(Si,Al,B)5O21(OH)
Habit: prismatic crystals up to 3-4cm long and 1cm thick. The prisms show the faces {100}, {010} and {110}. End faces are extremely rare and poorly developed. Only {111} could be identified.
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
'Orthopyroxene Subgroup'
Habit: euhedral to subhedral crystals characterized by the pyramidal faces {211}. Faces {101} not visible.
Colour: brownish
Description: The mineral represents a bronzite with (Fe, Mn): Mg = 15:85 and with Al largely substituting for Si.
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Habit: mostly anhedral flakes up to 1cm, sometimes showing prismatic faces and, very rarely, showing poorly developed pyramidal faces.
Colour: black
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
Sapphirine
Formula: Mg4(Mg3Al9)O4[Si3Al9O36]
Colour: slightly greenish blue
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
Spinel
Formula: MgAl2O4
Colour: blue
Description: pure MgAl-spinel
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Colour: black
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.
Zircon
Formula: Zr(SiO4)
Habit: euhedral crystals
Reference: von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Spinel'4.BB.05MgAl2O4
Group 9 - Silicates
'Cordierite'9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
'Kornerupine'9.BJ.50Mg3Al6(Si,Al,B)5O21(OH)
'Phlogopite'9.EC.20KMg3(AlSi3O10)(OH)2
'Sapphirine'9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
'Zircon'9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Gneiss'-
'Orthopyroxene Subgroup'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
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 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.
'Albite-Anorthite Series'-
'Gneiss'-
'Orthopyroxene Subgroup'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

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)
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
OOxygen
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O KornerupineMg3Al6(Si,Al,B)5O21(OH)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
O SpinelMgAl2O4
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O ZirconZr(SiO4)
MgMagnesium
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
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 KornerupineMg3Al6(Si,Al,B)5O21(OH)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Al SpinelMgAl2O4
SiSilicon
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si KornerupineMg3Al6(Si,Al,B)5O21(OH)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Si ZirconZr(SiO4)
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
FeIron
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)
ZrZirconium
Zr ZirconZr(SiO4)

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
von Knorring, O., Sahama, Th.G., and Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland: 41: 79-84.

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