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Andranondambo sapphire deposits, Maromby Commune, Amboasary Sud, Anosy, Madagascari
Regional Level Types
Andranondambo sapphire depositsGroup of Deposits
Maromby CommuneCommune
Amboasary SudDistrict
AnosyRegion
MadagascarCountry

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Name(s) in local language(s):Fitandrahana safira tany Andranondambo, Kaominina Maromby, Distrikan'i Amboasary, Faritra Anosy, Faritanin'i Toliary, Madagasikara
Latitude & Longitude (WGS84): 24° 25' 0'' South , 46° 34' 60'' East
Latitude & Longitude (decimal): -24.41667,46.58333
GeoHash:G#: m59jh50fw
Locality type:Group of Deposits
Köppen climate type:Cfa : Humid subtropical climate


Gem sapphires were rediscovered in 1991 close to the small village of Andranondambo. Earlier workings for phlogopite and thorianite already existed close to the village. The discovery caused a huge sapphire fever, and the village housed at times (1993-1997) nearly 100.000 people. The Andranondambo sapphire deposits cover an area about 3 km long and 0.5-1 km wide. Local miners have dug out a large number of small holes. They are often visible as 2-3m narrow sinkholes in the ground with underground shafts, some as deep as 20-30 m.
Most of the claims and diggings are now more or less abandoned (2009)
The sapphires are found in high-grade granulites in metamorphic rocks belonging to the Proterozoic Tranomaro group. They are formed in Th-U skarns belonging to the Pan-African granulitic formations.

Regions containing this locality

Tuléar Province (Toliara), Madagascar

Province - 242 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


18 valid minerals.

Detailed Mineral List:

'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Anorthite
Formula: Ca(Al2Si2O8)
Description: As common mineral in the skarn but also as colorless transparent 0,5 mm grains or as whitish crystals as inclusions or filling fissures in sapphires. The plagioclase inclusions were showed to be of an anorthite composition (Schwartz and Petsch 1996)
Reference: Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Baddeleyite
Formula: ZrO2
Reference: www.gemresearch.ch/andranon/madcon.htm.
Calcite
Formula: CaCO3
Description: As up to 1mm long inclusions in sapphires
Reference: AmMin 87:132-141 ; Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Corundum
Formula: Al2O3
Reference: Arliguie M. photo and collection
Corundum var: Sapphire
Formula: Al2O3
Reference: Schwartz, D. And Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99; Giuliani,G. et al (2007): Mineralium Deposita 42, 251-270.
Diaspore
Formula: AlO(OH)
Reference: www.gemresearch.ch/andranon/madcon.htm.
Diopside
Formula: CaMgSi2O6
Description: De Grave et al (2002) studied a dark pyroxene crystals found in a calcite vein cutting across marbles and skarns.. It corresponded to a Fe- and Ti-bearing aluminian diopside.
Reference: AmMin 87:132-141 (2002)
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Giuliani, G., Fallick, A., Rakotondrazafy, M., Ohnenstetter, D., Andriamamonjy, A., Ralantoarison, T., Rakotosamizanany, S., Razanatseheno, M., Offant, Y., Garnier, V., Dunaigre, C., Schwarz, D., Mercier, A., Ratrimo, V., and Ralison, B. (2007): Mineralium Deposita 42, 251-270.
Fluorite
Formula: CaF2
Reference: www.gemresearch.ch/andranon/madcon.htm.
Hedenbergite
Formula: CaFe2+Si2O6
Colour: greenish brown
Description: As grains as inclusions in sapphire
Reference: Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Hibonite
Formula: (Ca,Ce)(Al,Ti,Mg)12O19
Reference: Giuliani, G., Fallick, A., Rakotondrazafy, M., Ohnenstetter, D., Andriamamonjy, A., Ralantoarison, T., Rakotosamizanany, S., Razanatseheno, M., Offant, Y., Garnier, V., Dunaigre, C., Schwarz, D., Mercier, A., Ratrimo, V., and Ralison, B. (2007): Mineralium Deposita 42, 251-270.
'K Feldspar'
Reference: Giuliani, G., Fallick, A., Rakotondrazafy, M., Ohnenstetter, D., Andriamamonjy, A., Ralantoarison, T., Rakotosamizanany, S., Razanatseheno, M., Offant, Y., Garnier, V., Dunaigre, C., Schwarz, D., Mercier, A., Ratrimo, V., and Ralison, B. (2007): Mineralium Deposita 42, 251-270.; Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Giuliani, G., Fallick, A., Rakotondrazafy, M., Ohnenstetter, D., Andriamamonjy, A., Ralantoarison, T., Rakotosamizanany, S., Razanatseheno, M., Offant, Y., Garnier, V., Dunaigre, C., Schwarz, D., Mercier, A., Ratrimo, V., and Ralison, B. (2007): Mineralium Deposita 42, 251-270.
'Pyroxene Group'
Reference: Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Quartz
Formula: SiO2
Reference: www.gemresearch.ch/andranon/madcon.htm.
Quartz var: Chalcedony ?
Formula: SiO2
Description: Probably mislabelled specimen
Reference: Martins da Pedra photo and specimen
Rutile
Formula: TiO2
Description: As microscopic inclusions in sapphire as oriented needlelike crystals
Reference: Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
'Scapolite'
Reference: Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Spinel
Formula: MgAl2O4
Reference: Arliguie M collection & photo
Titanite
Formula: CaTi(SiO4)O
Reference: Wolfgang Hampel photo (in situ)
Wollastonite
Formula: CaSiO3
Reference: Schwartz, D. and Petsch, E. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
Zircon
Formula: Zr(SiO4)
Reference: www.gemresearch.ch/andranon/madcon.htm.;
Zirconolite
Formula: CaZrTi2O7
Reference: www.gemresearch.ch/andranon/madcon.htm.

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Baddeleyite'4.DE.35ZrO2
Corundum4.CB.05Al2O3
var: Sapphire4.CB.05Al2O3
Diaspore4.FD.10AlO(OH)
Hibonite4.CC.45(Ca,Ce)(Al,Ti,Mg)12O19
Quartz4.DA.05SiO2
var: Chalcedony ?4.DA.05SiO2
Rutile4.DB.05TiO2
Spinel4.BB.05MgAl2O4
Zirconolite4.DH.30CaZrTi2O7
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
'Anorthite'9.FA.35Ca(Al2Si2O8)
Diopside9.DA.15CaMgSi2O6
Hedenbergite9.DA.15CaFe2+Si2O6
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Titanite9.AG.15CaTi(SiO4)O
Wollastonite9.DG.05CaSiO3
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
K Feldspar-
Pyroxene Group-
Scapolite-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
AX2
Baddeleyite4.4.14.1ZrO2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Diaspore6.1.1.1AlO(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
AB12X19
Hibonite7.4.1.1(Ca,Ce)(Al,Ti,Mg)12O19
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
A2B2O6(O,OH,F)
Zirconolite8.2.5.5CaZrTi2O7
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Hedenbergite65.1.3a.2CaFe2+Si2O6
Single-Width Unbranched Chains, W=1 with chains P=3
Wollastonite65.2.1.1cCaSiO3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Anorthite-Ca(Al2Si2O8)
Corundum
var: Sapphire
-Al2O3
'K Feldspar'-
'Pyroxene Group'-
Quartz
var: Chalcedony ?
-SiO2
'Scapolite'-

List of minerals for each chemical element

HHydrogen
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H DiasporeAlO(OH)
H PhlogopiteKMg3(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O AnorthiteCa(Al2Si2O8)
O BaddeleyiteZrO2
O CalciteCaCO3
O Quartz (var: Chalcedony)SiO2
O CorundumAl2O3
O DiasporeAlO(OH)
O DiopsideCaMgSi2O6
O FluorapatiteCa5(PO4)3F
O HedenbergiteCaFe2+Si2O6
O Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
O PhlogopiteKMg3(AlSi3O10)(OH)2
O QuartzSiO2
O RutileTiO2
O Corundum (var: Sapphire)Al2O3
O SpinelMgAl2O4
O TitaniteCaTi(SiO4)O
O WollastoniteCaSiO3
O ZirconZr(SiO4)
O ZirconoliteCaZrTi2O7
FFluorine
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
F FluorapatiteCa5(PO4)3F
F FluoriteCaF2
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg SpinelMgAl2O4
AlAluminium
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al AnorthiteCa(Al2Si2O8)
Al CorundumAl2O3
Al DiasporeAlO(OH)
Al Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al Corundum (var: Sapphire)Al2O3
Al SpinelMgAl2O4
SiSilicon
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si AnorthiteCa(Al2Si2O8)
Si Quartz (var: Chalcedony)SiO2
Si DiopsideCaMgSi2O6
Si HedenbergiteCaFe2+Si2O6
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si QuartzSiO2
Si TitaniteCaTi(SiO4)O
Si WollastoniteCaSiO3
Si ZirconZr(SiO4)
PPhosphorus
P FluorapatiteCa5(PO4)3F
ClChlorine
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca AnorthiteCa(Al2Si2O8)
Ca CalciteCaCO3
Ca DiopsideCaMgSi2O6
Ca FluorapatiteCa5(PO4)3F
Ca FluoriteCaF2
Ca HedenbergiteCaFe2+Si2O6
Ca Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Ca TitaniteCaTi(SiO4)O
Ca WollastoniteCaSiO3
Ca ZirconoliteCaZrTi2O7
TiTitanium
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Ti RutileTiO2
Ti TitaniteCaTi(SiO4)O
Ti ZirconoliteCaZrTi2O7
FeIron
Fe HedenbergiteCaFe2+Si2O6
ZrZirconium
Zr BaddeleyiteZrO2
Zr ZirconZr(SiO4)
Zr ZirconoliteCaZrTi2O7
CeCerium
Ce Hibonite(Ca,Ce)(Al,Ti,Mg)12O19

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

Paleoproterozoic
1600 - 2500 Ma



ID: 3191055
Paleoproterozoic crystalline metamorphic rocks

Age: Proterozoic (1600 - 2500 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]

Rhyacian
2050 - 2300 Ma



ID: 3306489

Age: Rhyacian (2050 - 2300 Ma)

Lithology: Metamorphic

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

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)
Schwartz, D., Petsch, E. & Kanis, J. (1996): Sapphires from the Andranomdambo region, Madagascar. Gems and Gemology 32 (2): 80-99
de Grave, J., de Paepe, P., de Grave, E. , Vochten, R. and Eeckhout, S.G.: (2002): Mineralogical and Mössbauer spectroscopic study of a diopside occurring in the marbles of Andranondambo, southern Madagascar. American Mineralogist 87: 132-141
Giuliani, G., Fallick, A., Rakotondrazafy, M., Ohnenstetter, D., Andriamamonjy, A., Ralantoarison, T., Rakotosamizanany, S., Razanatseheno, M., Offant, Y., Garnier, V., Dunaigre, C., Schwarz, D., Mercier, A., Ratrimo, V., and Ralison, B. (2007): Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita 42, 251-270


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