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Imalo, Andrembesoa, Betafo, Vakinankaratra, Madagascari
Regional Level Types
Imalo- not defined -
AndrembesoaCommune
BetafoDistrict
VakinankaratraRegion
MadagascarCountry

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Name in Malagasy:Imalo, Kaominin' Andrembesoa, Distrikan'i Betafo, Vakinankaratra, Madagasikara
Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 20° South , 46° East (est.)
Margin of Error:~36km
Köppen climate type:Cwb : Subtropical highland climate or temperate oceanic climate with dry winters


A granite pegmatite (NYF-type) hosted in marbles known for hambergite specimens and located south of Betafo, beside the river Mania. Specimens with phenakite crystals embedded in milkwhite quartz with amazonite crystals were found close to the classic Imalo locality at the beginning of the 21st century.

Regions containing this locality

Somali Plate (Somalia Plate)Plate
Antananarivo Province, MadagascarProvince (Abolished)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

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:

Beryl
Formula: Be3Al2(Si6O18)
Danburite
Formula: CaB2Si2O8
Hambergite
Formula: Be2(BO3)(OH)
Microcline
Formula: K(AlSi3O8)
Microcline var: Amazonite
Formula: K(AlSi3O8)
Phenakite
Formula: Be2SiO4
'Pyrochlore Supergroup'
Formula: A2-mD2X6-wZ1-n
Quartz
Formula: SiO2
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 6 - Borates
Hambergite6.AB.05Be2(BO3)(OH)
Group 9 - Silicates
Beryl9.CJ.05Be3Al2(Si6O18)
Danburite9.FA.65CaB2Si2O8
Microcline9.FA.30K(AlSi3O8)
var: Amazonite9.FA.30K(AlSi3O8)
Phenakite9.AA.05Be2SiO4
Unclassified Minerals, Rocks, etc.
'Pyrochlore Supergroup'-A2-mD2X6-wZ1-n
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 25 - ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
Monoborates
Hambergite25.1.1.1Be2(BO3)(OH)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination
Phenakite51.1.1.1Be2SiO4
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with[Si2O7] with borate groups
Danburite56.3.1.1CaB2Si2O8
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
var: Amazonite-K(AlSi3O8)
'Pyrochlore Supergroup'-A2-mD2X6-wZ1-n
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H HambergiteBe2(BO3)(OH)
BeBeryllium
Be HambergiteBe2(BO3)(OH)
Be PhenakiteBe2SiO4
Be BerylBe3Al2(Si6O18)
BBoron
B HambergiteBe2(BO3)(OH)
B DanburiteCaB2Si2O8
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
OOxygen
O HambergiteBe2(BO3)(OH)
O PhenakiteBe2SiO4
O Microcline (var: Amazonite)K(AlSi3O8)
O DanburiteCaB2Si2O8
O BerylBe3Al2(Si6O18)
O QuartzSiO2
O MicroclineK(AlSi3O8)
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
AlAluminium
Al Microcline (var: Amazonite)K(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al MicroclineK(AlSi3O8)
SiSilicon
Si PhenakiteBe2SiO4
Si Microcline (var: Amazonite)K(AlSi3O8)
Si DanburiteCaB2Si2O8
Si BerylBe3Al2(Si6O18)
Si QuartzSiO2
Si MicroclineK(AlSi3O8)
KPotassium
K Microcline (var: Amazonite)K(AlSi3O8)
K MicroclineK(AlSi3O8)
CaCalcium
Ca DanburiteCaB2Si2O8

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lacroix, A. (1912) Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris, 35, 76-84 [on the find of hambergite].
Lacroix, A. (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris, 338-39 [on the find of hambergite].
Pezzotta, F. (2005) A first attempt to the petrogenesis and the classification of granitic pegmatites of the Itremo Region (central Madagascar).

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