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Lake Alaotra, Alaotra-Mangoro, Madagascari
Regional Level Types
Lake AlaotraLake
Alaotra-MangoroRegion
MadagascarCountry

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Key
Locality type:
Other Languages:
French:
Lac Alaotra, Alaotra-Mangoro, Madagascar
German:
Lac Alaotra, Alaotra-Mangoro, Madagaskar
Italian:
lago Alaotra, regione di Alaotra Mangoro, Madagascar
Malagasy:
Farihy Aloatra, Faritr' Alaotra-Mangoro, Madagasikara
Russian:
Алаутра, Алаутра-Мангуру, Мадагаскар
Simplified Chinese:
阿劳特拉湖, 阿拉奧特拉-曼古羅區, 马达加斯加
Spanish:
Lago Alaotra, Región de Alaotra-Mangoro, Madagascar
Belarusian:
Алаўтра, Мадагаскар
Breton:
Lenn Alaotra, Alaotra-Mangoro, Madagaskar
Catalan:
Alaotra, Madagascar
Cebuano:
Farihy Alaotra, Alaotra Mangoro Region, Madagascar
Chuvash:
Алаутра, Мадагаскар Республики
Dutch:
Alaotrameer, Alaotra-Mangoro, Madagaskar
Esperanto:
Lago Alaotra, Alaotra-Mangoro, Madagaskaro
Estonian:
Alaotra järv, Madagaskar
Finnish:
Alaotrajärvi, Alaotra-Mangoro, Madagaskar
Georgian:
ალაოტრა, მადაგასკარი
Greek:
Λίμνη Αλαότρα, Αλαότρα-Μανγκόρο, Μαδαγασκάρη
Hungarian:
Alaotra-tó, Madagaszkár
Indonesian:
Danau Alaotra, Alaotra-Mangoro, Madagaskar
Japanese:
アラウチャ湖, アロチャ=マングル地域圏, マダガスカル
Lithuanian:
Alaotra, Alotra-Mangoras, Madagaskaras
Polish:
Alaotra, Alaotra-Mangoro, Madagaskar
Portuguese:
Lago Alaotra, Alaotra Mangoro, Madagáscar
Romanian:
Lacul Alaotra, Regiunea Alaotra-Mangoro, Madagascar
Serbian:
Алаотра, Мадагаскар
Serbo-Croatian:
Alaotra, Regija Alaotra-Mangoro, Madagaskar
Swedish:
Alaotra, Alaotra Mangororegionen, Madagaskar
Turkish:
Alaotra Gölü, Alaotra-Mangoro, Madagaskar


Lac Alaotra is situated about 180 km NE of the capital Antananarivo and is the biggest lake in Madagascar. Several mineral localities are found around the lake. In general, the localities west and northwest of the lake belong to the Amparafaravola District and the localities east and south of the lake belong to the Ambatondrazaka District . Several LCT pegmatites of the Beryl-Columbite subtype are located east of the lake, and LCT pegmatites of the Chrysoberyl subtype southeast of the lake.

Minerals from these localities has often been brought to the market in the town of Ambatondrazaka. Thus minerals from this region are often labelled "Ambatondrazaka" or "Lake Alaotra". For chrysoberyl specimens see especially the localities Andreba, Ambatosoratra, Masiadrivotra and Ampanorana Est .

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Beryl
Formula: Be3Al2(Si6O18)
Reference: Michel Arliguie collection, photo id-ID: 947014 (old specimen)
Beryl var. Aquamarine
Formula: Be3Al2Si6O18
Reference: Michel Arliguie collection & photo (Photo ID: 947596, old sample)
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Van King
Gold
Formula: Au
Reference: A. Lacroix: Minéralogie de la France et de ses Colonies, Vol. 1, pp. 17-34 (1916)
Quartz
Formula: SiO2
Reference: Van King
Quartz var. Amethyst
Formula: SiO2
Reference: Van King
Quartz var. Sceptre Quartz
Formula: SiO2
Reference: Van King
Quartz var. Smoky Quartz
Formula: SiO2
Reference: Michel Arliguie collection & photo (Photo ID: Photo ID: 953501)
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: [www.thamesvalleyminerals.com]

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var. Amethyst4.DA.05SiO2
var. Sceptre Quartz4.DA.05SiO2
var. Smoky Quartz4.DA.05SiO2
Group 9 - Silicates
Beryl9.CJ.05Be3Al2(Si6O18)
var. Aquamarine9.CJ.05Be3Al2Si6O18
Elbaite9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Elbaite61.3.1.8Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Beryl
var. Aquamarine
-Be3Al2Si6O18
Quartz
var. Amethyst
-SiO2
var. Sceptre Quartz-SiO2
var. Smoky Quartz-SiO2

List of minerals for each chemical element

HHydrogen
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
LiLithium
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
Be Beryl var. AquamarineBe3Al2Si6O18
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O QuartzSiO2
O Quartz var. Sceptre QuartzSiO2
O Quartz var. AmethystSiO2
O BerylBe3Al2(Si6O18)
O Beryl var. AquamarineBe3Al2Si6O18
O Quartz var. Smoky QuartzSiO2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al BerylBe3Al2(Si6O18)
Al Beryl var. AquamarineBe3Al2Si6O18
SiSilicon
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si QuartzSiO2
Si Quartz var. Sceptre QuartzSiO2
Si Quartz var. AmethystSiO2
Si BerylBe3Al2(Si6O18)
Si Beryl var. AquamarineBe3Al2Si6O18
Si Quartz var. Smoky QuartzSiO2
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AuGold
Au GoldAu

Fossils

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Pezzotta, F. (1999) Madagaskar - Das Paradies der Mineralien und Edelsteine. ExtraLapis, 17, 47-48 [German version].

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Lake_Alaotra
Wikidata ID:Q575679
GeoNames ID:1084742

Other Regions, Features and Areas that Intersect

Somali PlateTectonic Plate

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