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Maromby pegmatite (Andreba), Ambatosoratra Commune, Ambatondrazaka District, Alaotra-Mangoro, Madagascari
Regional Level Types
Maromby pegmatite (Andreba)Pegmatite
Ambatosoratra CommuneCommune
Ambatondrazaka DistrictDistrict
Alaotra-MangoroRegion
MadagascarCountry

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Latitude & Longitude (WGS84):
17° 39' 11'' South , 48° 31' 4'' East
Latitude & Longitude (decimal):
-17.65333,48.51778
GeoHash:
G#: mhfe8439f
GRN:
S12E33
Type:
Pegmatite
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Ambatondrazaka43,134 (2018)22.7km
Amparafaravola51,519 (2018)32.0km
Sahatavy10,000 (2018)55.9km
Mindat Locality ID:
193345
Long-form identifier:
mindat:1:2:193345:4
GUID (UUID V4):
e3184f44-4ac5-461b-a384-81b5c8a63772
Other Languages:
Malagasy:
Maromby, Kaominin' Ambatosoratra, Distrikan' Ambatondrazaka, Faritr' Alaotra-Mangoro, Madagasikara


An unnamed LCT pegmatite of the chrysoberyl subtype located south-southeast of the village of Andreba, and 700m southwest of Maromby on the eastern shore of Lake Alaotra. Good specimens of chrysoberyl twins were found here in 1997.
The locality was described by Lacroix (1922) as Andreba. The locality is found on the left side of the small Maromby stream (also called Antanifotsy stream).

Possible coordinates, based on Google Earth, may be 17°39'12.01"S 48°31'4.01"E [A guess, must be verified].

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


7 valid minerals.

Rock Types Recorded

Note: 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:

ⓘ Beryl
Formula: Be3Al2(Si6O18)
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Chrysoberyl
Formula: BeAl2O4
ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series'
ⓘ Dumortierite
Formula: Al(Al2O)(Al2O)2(SiO4)3(BO3)
ⓘ Microcline
Formula: K(AlSi3O8)
ⓘ 'Monazite'
Formula: REE(PO4)
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Quartz
Formula: SiO2
Description: pseudo-cubic septer amethyst
ⓘ Quartz var. Amethyst
Formula: SiO2
Description: pseudo-cubic septer amethyst
ⓘ Quartz var. Smoky Quartz
Formula: SiO2
ⓘ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
ⓘ Vermiculite
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘChrysoberyl4.BA.05BeAl2O4
ⓘQuartz
var. Amethyst		4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘvar. Smoky Quartz4.DA.05SiO2
Group 9 - Silicates
ⓘDumortierite9.AJ.10Al(Al2O)(Al2O)2(SiO4)3(BO3)
ⓘBeryl9.CJ.05Be3Al2(Si6O18)
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘVermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
ⓘMicrocline9.FA.30K(AlSi3O8)
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Monazite'-REE(PO4)
ⓘ'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z
ⓘ'Columbite-(Fe)-Columbite-(Mn) Series'-

List of minerals for each chemical element

HHydrogen
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
BeBeryllium
Beⓘ BerylBe3Al2(Si6O18)
Beⓘ ChrysoberylBeAl2O4
BBoron
Bⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
OOxygen
Oⓘ Quartz var. AmethystSiO2
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ BerylBe3Al2(Si6O18)
Oⓘ ChrysoberylBeAl2O4
Oⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Oⓘ MicroclineK(AlSi3O8)
Oⓘ MonaziteREE(PO4)
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ Quartz var. Smoky QuartzSiO2
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
AlAluminium
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ BerylBe3Al2(Si6O18)
Alⓘ ChrysoberylBeAl2O4
Alⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Alⓘ MicroclineK(AlSi3O8)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
SiSilicon
Siⓘ Quartz var. AmethystSiO2
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ BerylBe3Al2(Si6O18)
Siⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Siⓘ MicroclineK(AlSi3O8)
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ Quartz var. Smoky QuartzSiO2
Siⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
PPhosphorus
Pⓘ MonaziteREE(PO4)
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MicroclineK(AlSi3O8)
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O

Other Regions, Features and Areas containing this locality

Madagascar
Somali PlateTectonic Plate

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.

References

Guigues, J. (1955) Étude des gisements de pegmatite de Madagascar (Deuxième partie) Travaux du Bureau Gèologique de Madagascar 67. Haut Commisariat de Madagascar et dependancespp.11-12
Pezzotta, Federico (1999) Madagaskar. Das Paradies der Mineralien und Edelsteine. extraLapis 17. Christian Weise Verlagp.48
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