Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Ianakafy (Inanakafy), Ianakafy, Betroka, Anosy, Madagascari
Regional Level Types
Ianakafy (Inanakafy)Village
IanakafyCommune
BetrokaDistrict
AnosyRegion
MadagascarCountry

This page is currently not sponsored. Click here to sponsor this page.
Key
Lock Map
Name in Malagasy:Ianakafy, Kaominin' Ianakafy, Distrikan'i Betroka, Faritr' Anosy, Madagasikara
Latitude & Longitude (WGS84): 23° 21' 14'' South , 45° 26' 51'' East
Latitude & Longitude (decimal): -23.35400,45.44774
GeoHash:G#: m5b74hw11
Locality type:Village
Köppen climate type:Cfa : Humid subtropical climate


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.

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate
Tuléar Province (Toliara), MadagascarProvince

Select Mineral List Type

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.
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
Spinel4.BB.05MgAl2O4
Group 9 - Silicates
Cordierite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
Kornerupine9.BJ.50Mg3Al6(Si,Al,B)5O21(OH)
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Sapphirine9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'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, Mixtures, etc.
'Albite-Anorthite Series'-
'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 KornerupineMg3Al6(Si,Al,B)5O21(OH)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O SpinelMgAl2O4
O SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
O ZirconZr(SiO4)
MgMagnesium
Mg KornerupineMg3Al6(Si,Al,B)5O21(OH)
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mg SpinelMgAl2O4
Mg SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
AlAluminium
Al KornerupineMg3Al6(Si,Al,B)5O21(OH)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al SpinelMgAl2O4
Al SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
SiSilicon
Si KornerupineMg3Al6(Si,Al,B)5O21(OH)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
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)

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

Mesoproterozoic
1000 - 1600 Ma



ID: 3311848

Age: Mesoproterozoic (1000 - 1600 Ma)

Lithology: Plutonic and metamorphic

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

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]

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)
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.

External Links



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 19, 2019 16:13:05 Page generated: February 4, 2019 08:29:01
Go to top of page