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Lac Alaotra (Lake Alaotra), Alaotra-Mangoro, Madagascari
Regional Level Types
Lac Alaotra (Lake Alaotra)Lake
Alaotra-MangoroRegion
MadagascarCountry

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Name(s) in local language(s):Lac Alaotra, Faritra Alaotra-Mangoro, Faritanin'i Toamasina, Madagasikara
Locality type:Lake


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 Strunz Dana Chemical Elements

Mineral List


4 valid minerals.

Detailed Mineral List:

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
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
Group 9 - Silicates
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 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, Rocks, etc.
var: Amethyst-SiO2
var: Sceptre Quartz-SiO2

List of minerals for each chemical element

HHydrogen
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
LiLithium
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
BBoron
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O Quartz (var: Amethyst)SiO2
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O QuartzSiO2
O Quartz (var: Sceptre Quartz)SiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
NaSodium
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si Quartz (var: Amethyst)SiO2
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si QuartzSiO2
Si Quartz (var: Sceptre Quartz)SiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AuGold
Au GoldAu

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].

Localities in this Region
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Some regions, for example mining districts and mountain ranges, cut across political boundaries and do fit neatly into the standard locality hierarchy. This list includes regions that overlap this region in part if not fully.

Toamasina Province (Tamatave), Madagascar

Province (Abolished) - 120 mineral species & varietal names listed

The following list is the regular hierarchical locality list for this region.


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.
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