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Tompoambohitra (Tokambohitra; Antokambohitra), Sahatany Valley, Ibity Commune, Antsirabe II District, Vakinankaratra Region, Antananarivo Province, Madagascar

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Latitude & Longitude (WGS84): 20° 3' 56'' South , 46° 58' 8'' East
Latitude & Longitude (decimal): -20.06556,46.96889
GeoHash:G#: mh3mug1tw
Köppen climate type:Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Name(s) in local language(s):(Tampombohitra)


A complex type LCT pegmatite worked for gem polychromatic tourmalines situated on the SE side of Mt. Tompoambohitra in the Sahatany Valley.

Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

Tompoambohitra (Tokambohitra), Sahatany Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar
Tompoambohitra (Tokambohitra; Antokambohitra), Sahatany Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar
Tokambohitra, Sahatany Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar
Tompoambohitra (Tokambohitra), Sahatany Valley, Sahatany Pegmatite Field (Mt Bity (Ibity) area), Vakinankaratra Region (Betafo - Antsirabé region), Antananarivo Province, Madagascar

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

Cookeite
Formula: (Al2Li)Al2(AlSi3O10)(OH)8
Reference: Larsen, K. E. (2003): Mineralene i Sahatany pegmatittfelt, Madagaskar. Norsk Bergverksmuseum Skrift, 25, 5-18 (in norwegian)
Microcline
Formula: K(AlSi3O8)
Reference: Larsen, K. E. (2003): Mineralene i Sahatany pegmatittfelt, Madagaskar. Norsk Bergverksmuseum Skrift, 25, 5-18 (in norwegian)
Pezzottaite
Formula: Cs(Be2Li)Al2(Si6O18)
Reference: Rob Lavinsky photo id 744080 ( Dr. Federico Pezzotta is cited in caption on the validity of the id)
Pollucite ?
Formula: (Cs,Na)2(Al2Si4O12) · 2H2O
Reference: Alain Hanson Collection (Waiting to be analyzed to confirm id, photo id 499876)
Pyrochlore Supergroup
Formula: A2-mD2X6-wZ1-n
Reference: Knut Edvard Larsen collection (MM #2020 & MM #1522)
Quartz
Formula: SiO2
Reference: Knut Edvard Larsen collection
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Knut Edvard Larsen collection
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Knut Edvard Larsen collection
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Rakotoarison, W. (1964): Les pegmatites de la Sahatany. Archive du Service Géologique Madagascar. A.1983, p.1-39.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Quartz'4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Group 9 - Silicates
'Cookeite'9.EC.55(Al2Li)Al2(AlSi3O10)(OH)8
'Microcline'9.FA.30K(AlSi3O8)
'Pezzottaite'9.CJ.60Cs(Be2Li)Al2(Si6O18)
'Pollucite' ?9.GB.05(Cs,Na)2(Al2Si4O12) · 2H2O
'Schorl'9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
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 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Cookeite71.4.1.2(Al2Li)Al2(AlSi3O10)(OH)8
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)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Pollucite ?77.1.1.2(Cs,Na)2(Al2Si4O12) · 2H2O
Unclassified Minerals, Rocks, etc.
Pezzottaite-Cs(Be2Li)Al2(Si6O18)
Pyrochlore Supergroup-A2-mD2X6-wZ1-n
Quartz
var: Smoky Quartz
-SiO2
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
H Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
LiLithium
Li Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
Li PezzottaiteCs(Be2Li)Al2(Si6O18)
BeBeryllium
Be PezzottaiteCs(Be2Li)Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
OOxygen
O Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
O MicroclineK(AlSi3O8)
O PezzottaiteCs(Be2Li)Al2(Si6O18)
O Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
O QuartzSiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Quartz (var: Smoky Quartz)SiO2
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
NaSodium
Na Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Al Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
Al MicroclineK(AlSi3O8)
Al PezzottaiteCs(Be2Li)Al2(Si6O18)
Al Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
Si MicroclineK(AlSi3O8)
Si PezzottaiteCs(Be2Li)Al2(Si6O18)
Si Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Quartz (var: Smoky Quartz)SiO2
KPotassium
K MicroclineK(AlSi3O8)
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CsCaesium
Cs PezzottaiteCs(Be2Li)Al2(Si6O18)
Cs Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Ectasian - Calymmian
1200 - 1600 Ma



ID: 3184647
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1200 - 1600 Ma)

Lithology: Crystalline metamorphic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Rhyacian
2050 - 2300 Ma



ID: 3310225

Age: Rhyacian (2050 - 2300 Ma)

Lithology: Plutonic and metamorphic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rakotoarison, W. (1964): Les pegmatites de la Sahatany. Archive du Service Géologique Madagascar. A. 1983, 39p.


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