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Ambatomena ruby deposit, Isoanala Commune, Betroka District, Anosy Region (Fort Dauphin Region), Tuléar Province (Toliara), Madagascar

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Name(s) in local language(s):Ambatomena, Kaominin' Isoanala, 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
Locality type:Deposit
Age:487 Ma
Geologic Time:Furongian
Reference for age: Arima, M., Kimoto, K., Rakotondrazafy, R., Rakotoandrasana, N.O.T., & Ranaivoson, M.A. (2013): Igneous sapphirine in Ambatomena, southern Madagascar. Goldschmidt2013 Conference Abstracts. Mineralogical Magazine: 77 (5): 615
Köppen climate type:Cfa : Humid subtropical climate


Ruby-bearing cordieritite layers or lenses, intercalated within biotite-cordierite-sillimanite-bearing charnockite. The deposit was exploited by a private company from 2000 to 2001. The deposit occurs in the Androyan metamorphic series.
Located about 10 km NE of Isoanala.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


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: 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.
'Biotite'
Reference: Rakotondrazafy, A.F.M., Giuliani, G., Ohnenstetter, D., Fallick, A.E., Rakotosamizanany, S., Andriamamonjy, A., Ralantoarison, T., Razanatseheno, M., Offant, Y., Garnier, V., Maluski, H., Dunaigre, C., Schwarz, D., and Ratrimo, V. (2008): Gem corundum deposits of Madagascar: A review. Ore Geology Reviews 34: 134-154.
'Charnockitic granite'
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): Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita 42: 251-270.
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
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.
Corundum
Formula: Al2O3
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.
Corundum var: Ruby
Formula: Al2O3
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.
'commodity:Gemstones'
Reference:  
'Gneiss'
Reference: Arima, M., Kimoto, K., Rakotondrazafy, R., Rakotoandrasana, N.O.T., & Ranaivoson, M.A. (2013): Igneous sapphirine in Ambatomena, southern Madagascar. Goldschmidt2013 Conference Abstracts. Mineralogical Magazine: 77 (5): 615
'Orthopyroxene Subgroup'
Reference: Arima, M., Kimoto, K., Rakotondrazafy, R., Rakotoandrasana, N.O.T., & Ranaivoson, M.A. (2013): Igneous sapphirine in Ambatomena, southern Madagascar. Goldschmidt2013 Conference Abstracts. Mineralogical Magazine: 77 (5): 615
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.
Rutile
Formula: TiO2
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.
Sapphirine
Formula: Mg4(Mg3Al9)O4[Si3Al9O36]
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.; Arima, M., Kimoto, K., Rakotondrazafy, R., Rakotoandrasana, N.O.T., & Ranaivoson, M.A. (2013): Igneous sapphirine in Ambatomena, southern Madagascar. Goldschmidt2013 Conference Abstracts. Mineralogical Magazine: 77 (5): 615
Spinel
Formula: MgAl2O4
Reference: Arima, M., Kimoto, K., Rakotondrazafy, R., Rakotoandrasana, N.O.T., & Ranaivoson, M.A. (2013): Igneous sapphirine in Ambatomena, southern Madagascar. Goldschmidt2013 Conference Abstracts. Mineralogical Magazine: 77 (5): 615

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Corundum'4.CB.05Al2O3
var: Ruby4.CB.05Al2O3
Rutile4.DB.05TiO2
Spinel4.BB.05MgAl2O4
Group 9 - Silicates
'Cordierite'9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
'Phlogopite'9.EC.20KMg3(AlSi3O10)(OH)2
Sapphirine9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Biotite'-
'Charnockitic granite'-
'Gneiss'-
'Orthopyroxene Subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
AX2
Rutile4.4.1.1TiO2
Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
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'-
'Biotite'-
'Charnockitic granite'-
Corundum
var: Ruby
-Al2O3
'Gneiss'-
'Orthopyroxene Subgroup'-

List of minerals for each chemical element

HHydrogen
H PhlogopiteKMg3(AlSi3O10)(OH)2
OOxygen
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O CorundumAl2O3
O PhlogopiteKMg3(AlSi3O10)(OH)2
O Corundum (var: Ruby)Al2O3
O RutileTiO2
O SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
O SpinelMgAl2O4
MgMagnesium
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Mg SpinelMgAl2O4
AlAluminium
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al CorundumAl2O3
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al Corundum (var: Ruby)Al2O3
Al SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Al SpinelMgAl2O4
SiSilicon
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
TiTitanium
Ti RutileTiO2
FeIron
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)

Geochronology

Mineralization age: Furongian : 487 ± 4 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Paleozoic
  Cambrian
   Furongian
ⓘ Biotite487 ± 4 Ma

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
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.
Rakotondrazafy, A.F.M., Giuliani, G., Ohnenstetter, D., Fallick, A.E., Rakotosamizanany, S., Andriamamonjy, A., Ralantoarison, T., Razanatseheno, M., Offant, Y., Garnier, V., Maluski, H., Dunaigre, C., Schwarz, D., and Ratrimo, V. (2008): Gem corundum deposits of Madagascar: A review. Ore Geology Reviews 34: 134-154.
Arima, M., Kimoto, K., Rakotondrazafy, R., Rakotoandrasana, N.O.T., & Ranaivoson, M.A. (2013): Igneous sapphirine in Ambatomena, southern Madagascar. Goldschmidt2013 Conference Abstracts. Mineralogical Magazine: 77 (5): 615


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