Iankaroka corundum occurrence, Ianabinda, Betroka District, Anosy, Madagascari
Regional Level Types | |
---|---|
Iankaroka corundum occurrence | Occurrence |
Ianabinda | Commune |
Betroka District | District |
Anosy | Region |
Madagascar | Country |
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Latitude & Longitude (WGS84):
23° South , 45° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~29km
Type:
Köppen climate type:
Mindat Locality ID:
191484
Long-form identifier:
mindat:1:2:191484:2
GUID (UUID V4):
acca381d-5ca4-4b63-8c86-f9a30aa20aeb
Other Languages:
Malagasy:
Iankaroka, Kaominin' Ianabinda, Distrikan'i Betroka, Faritr' Anosy, Madagasikara
A polychromatic corundum-bearing cordieritite lens, first discovered in 1984-85, and described by Salerno (1992). Located near the village of Iankaroka about 35 km south of the town of Betroka.
The corundums are found in a cordieritite lens (~7 m long×4 m wide). The lens is intercalated concordantly between leptynitic biotite-cordierite-bearing gneisses. The geological unit formation: Androyan series.
The occurrence is characterized by polychromatic corundum displaying distinct colour bands.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
10 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Spinel | 4.BB.05 | MgAl2O4 |
ⓘ | Corundum | 4.CB.05 | Al2O3 |
ⓘ | var. Sapphire | 4.CB.05 | Al2O3 |
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 9 - Silicates | |||
ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
ⓘ | Sillimanite | 9.AF.05 | Al2(SiO4)O |
ⓘ | Cordierite | 9.CJ.10 | (Mg,Fe)2Al3(AlSi5O18) |
ⓘ | Enstatite var. Bronzite | 9.DA.05 | (Mg,Fe2+)2[SiO3]2 |
ⓘ | 9.DA.05 | Mg2Si2O6 | |
ⓘ | Sapphirine | 9.DH.45 | Mg4(Mg3Al9)O4[Si3Al9O36] |
ⓘ | Phlogopite | 9.EC.20 | KMg3(AlSi3O10)(OH)2 |
Unclassified | |||
ⓘ | 'K Feldspar' | - | |
ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
ⓘ | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
ⓘ | 'Chlorite Group' | - | |
ⓘ | 'Orthopyroxene Subgroup' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
H | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
B | Boron | |
B | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | Oxygen | |
O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
O | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
O | ⓘ Corundum | Al2O3 |
O | ⓘ Enstatite | Mg2Si2O6 |
O | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
O | ⓘ Quartz | SiO2 |
O | ⓘ Corundum var. Sapphire | Al2O3 |
O | ⓘ Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] |
O | ⓘ Sillimanite | Al2(SiO4)O |
O | ⓘ Spinel | MgAl2O4 |
O | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | ⓘ Zircon | Zr(SiO4) |
O | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
F | Fluorine | |
F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Na | Sodium | |
Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Mg | Magnesium | |
Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Mg | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
Mg | ⓘ Enstatite | Mg2Si2O6 |
Mg | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Mg | ⓘ Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] |
Mg | ⓘ Spinel | MgAl2O4 |
Mg | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
Al | Aluminium | |
Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Al | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
Al | ⓘ Corundum | Al2O3 |
Al | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Al | ⓘ Corundum var. Sapphire | Al2O3 |
Al | ⓘ Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] |
Al | ⓘ Sillimanite | Al2(SiO4)O |
Al | ⓘ Spinel | MgAl2O4 |
Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Si | Silicon | |
Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Si | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
Si | ⓘ Enstatite | Mg2Si2O6 |
Si | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Si | ⓘ Quartz | SiO2 |
Si | ⓘ Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] |
Si | ⓘ Sillimanite | Al2(SiO4)O |
Si | ⓘ Zircon | Zr(SiO4) |
Si | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
S | Sulfur | |
S | ⓘ Pyrite | FeS2 |
K | Potassium | |
K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
K | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Ti | Titanium | |
Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | Iron | |
Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | ⓘ Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
Zr | Zirconium | |
Zr | ⓘ Zircon | Zr(SiO4) |
Other Regions, Features and Areas containing this locality
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References
Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, Théogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3
Rakotondrazafy, Amos Fety Michel, Giuliani, Gaston, Ohnenstetter, Daniel, Fallick, Anthony E., Rakotosamizanany, Saholy, Andriamamonjy, Alfred, Ralantoarison, Théogène, Razanatseheno, Madison, Offant, Yohann, Garnier, Virginie, Maluski, Henri, Dunaigre, Christian, Schwarz, Dietmar, Ratrimo, Voahangy (2008) Gem corundum deposits of Madagascar: A review. Ore Geology Reviews, 34 (1) 134-154 doi:10.1016/j.oregeorev.2007.05.001