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Andilamena Quartz Quarries, Andranotokana Massif, Andilamena, Alaotra-Mangoro, Madagascari
Regional Level Types
Andilamena Quartz QuarriesGroup of Quarries
Andranotokana MassifMassif
AndilamenaDistrict
Alaotra-MangoroRegion
MadagascarCountry

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Latitude & Longitude (WGS84):
16° South , 48° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~70km
Locality type:
Group of Quarries
Köppen climate type:
Name(s) in local language(s):
Fitondrahan' ny vatokaranana, Andranotokana Massif, Andilamena District, Alaotra-Mangoro Region, Toamasina Province (Tamatave), Madagascar


Several thousand specimens of Japanese law twin quartz, up to 25 cm large, were uncovered by the company Tropic Stone SARL, from June 2000 to February 2001 in a breccia complex, in the Andranotokana Massif, north of the village of Andilamena, north of Ambatondrazaka. The mineralization is linked to a hydrothermal activity associated with tectonics in a metamorphic context (Forner et al. 2001).

Specimens from this locality are often labelled with the locality "Andilamena" which is the name/center of the district where the specimens were found.

Locality spelled erroneously "Anohlamena" in Moore (2001).

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate
Toamasina Province (Tamatave), MadagascarProvince (Abolished)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

4 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!

Rock list contains entries from the region specified including sub-localities

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Alphabetical List Tree Diagram

Detailed Mineral List:

'Ferrierite'
Reference: Forner, H.. Gautier, F. & Thomas, L. (2001) Les macles de quartz de la région d`Andilamena, Madagascar. Le Règne Minéral, nr. 39, 42-46.
Goethite
Formula: α-Fe3+O(OH)
Habit: needles
Description: as inclusions in amethyst scepters
Reference: Knut Edvard Larsen collection
Hematite
Formula: Fe2O3
Reference: Moore, T.(2001): What is new in Minerals. Tuscon Show 2001. Mineralogical Record 32(3), p 252
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Forner, H.. Gautier, F. & Thomas, L. (2001) Les macles de quartz de la région d`Andilamena, Madagascar. Le Règne Minéral. 39: 42-46.
Quartz
Formula: SiO2
Description: Japan-Law twins
Reference: Forner, H.. Gautier, F. & Thomas, L. (2001) Les macles de quartz de la région d`Andilamena, Madagascar. Le Règne Minéral, nr. 39, 42-46.
Quartz var: Amethyst
Formula: SiO2
Reference: Moore, T.(2001): What is new in Minerals. Tuscon Show 2001. Mineralogical Record 32(3), p 252
Quartz var: Chalcedony
Formula: SiO2
Reference: Moore, T.(2001): What is new in Minerals. Tuscon Show 2001. Mineralogical Record 32(3), p 252
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Treillard Michel photo & collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Group 9 - Silicates
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified Minerals, Rocks, etc.
'Ferrierite'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Ferrierite'-
Kaolinite-Al2(Si2O5)(OH)4
Quartz
var: Amethyst
-SiO2
var: Chalcedony-SiO2
var: Smoky Quartz-SiO2

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H KaoliniteAl2(Si2O5)(OH)4
OOxygen
O QuartzSiO2
O Quartz (var: Amethyst)SiO2
O HematiteFe2O3
O Quartz (var: Chalcedony)SiO2
O Goethiteα-Fe3+O(OH)
O Quartz (var: Smoky Quartz)SiO2
O KaoliniteAl2(Si2O5)(OH)4
AlAluminium
Al KaoliniteAl2(Si2O5)(OH)4
SiSilicon
Si QuartzSiO2
Si Quartz (var: Amethyst)SiO2
Si Quartz (var: Chalcedony)SiO2
Si Quartz (var: Smoky Quartz)SiO2
Si KaoliniteAl2(Si2O5)(OH)4
FeIron
Fe HematiteFe2O3
Fe Goethiteα-Fe3+O(OH)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Moore, T. (2001) What is new in Minerals. Tucson Show 2001. Mineralogical Record, 32(3), 252.
Forner, H., Gautier, F., and Thomas, L. (2001) Les macles de quartz de la région d'Andilamena, Madagascar. Le Règne Minéral, 39, 42-46.
Moore, T. (2002) What's New in Minerals? Tucson Show 2002. Mineralogical Record, 33, 261-266, 273-275 [p. 273].

Localities in this Region
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  • Alaotra-Mangoro

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