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Antandrokomby pegmatite, Manandona Valley, Sahatsiho-Ambohimanjaka, Ambositra, Amoron'i Mania, Madagascari
Regional Level Types
Antandrokomby pegmatitePegmatite
Manandona ValleyValley
Sahatsiho-AmbohimanjakaCommune
AmbositraDistrict
Amoron'i ManiaRegion
MadagascarCountry
Antandrokomby pegmatite, Manandona Valley, Sahatany Pegmatite Field (Mt Ibity area), Madagascar

This page kindly sponsored by Domenico Preite
Key
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Latitude & Longitude (WGS84):
20° 14' 25'' South , 47° 1' 18'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Fandriana31,437 (2018)37.7km
Ambositra30,353 (2018)39.6km
Ambatofinandrahana25,997 (2018)41.5km
Antsirabe186,253 (2018)41.6km
Soanindrariny21,000 (2018)43.8km
Other/historical names associated with this locality:
Sahatany pegmatite field
Other Languages:
Malagasy:
Antandrokomby, Lohasahan'i Manandona, Kaominin'i Sahatsiho-Ambohimanjaka, Distrikan' Ambositra, Faritra Amoron'i Mania, Madagasikara


A complex type LCT pegmatite hosted in a metadolomite worked for gem tourmaline, spodumene and beryl from the beginning of the 20th century. Located near the village of Ambatolampy, about 35 kilometers south of Antsirabe, and in the Manandona Valley, south of the Ibity Massif (Mt.Ibity) in the central Highland of Madagascar. It is one of the most famous pegmatites in the Sahatany pegmatite field, but administratively, the locality is located just outside the border of the Vakinankaratra Region and the Antananarivo Province (where the Sahatany Valley and most of the other localities in the pegmatite field is located).

The pegmatite is a steeply dipping dike which measures 350 m x 1,2 meter.

NOTES on the mineral list:
- Some londonite-rhodizite specimens from the Antsongombato gem mine were sold as coming from Antandrokomby.

- Nizamoff et al. (2000) and Webber et al (2002) has shown that tourmalines from the miarolitic cavities at the Antandrokomby are members of the elbaite-schorl series with significant Mg and Ca content, and not liddicoatitic.

Regions containing this locality

Sahatany Pegmatite Field (Mt Ibity area), MadagascarPegmatite Field
Somali Plate (Somalia Plate)Tectonic Plate
Fianarantsoa Province, MadagascarProvince

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


31 valid minerals. 3 (TL) - type locality of valid minerals. 1 erroneous literature entry.

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:

Albite
Formula: Na(AlSi3O8)
Habit: Crystals up to 2 cm; feltlike masses; saccharoidal
Colour: Colorless; pale-blue; greyish
Description: often as overgrowth on microcline
Reference: Ranorosoa, N. , Fontan, F. & Fransolet, A-M. (1989): Rediscovery of manandonite in the Sahatany Valley, Madagascar. European Journal of Mineralogy 1, 633-638 ; [MinRec 33:165]
Albite var: Cleavelandite
Formula: Na(AlSi3O8)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Anatase
Formula: TiO2
Colour: beige
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Habit: microscopic crystals up to 100 microns in length (Nizamoff et al 200o)
Reference: Nizamoff, J.W. et al.(2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000
Arsenic
Formula: As
Reference: Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)
Autunite ?
Formula: Ca(UO2)2(PO4)2 · 11H2O
Description: Perhaps a possible misidentification of clinobisvanite ?? (not analysed, just listed in Ranorosoa (1986))
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Béhierite
Formula: (Ta5+,Nb5+)(BO4)
Reference: Falster, A.U. and Simmons, W.B.(2002): A second world location for behierite in Florence county, Wisconsin. Rocks & Minerals may-june 2002
Beryl
Formula: Be3Al2(Si6O18)
Description: Cesium-rich variety
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Bismuth
Formula: Bi
Reference: Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)
Brockite
Formula: (Ca,Th,Ce)PO4 · H2O
Reference: Dr.Federico Pezzotta analysis
Clinobisvanite
Formula: Bi(VO4)
Reference: Extra Lapis nr 17. Madagascar p 4 (german edition)]
'Clinoptilolite'
Description: Earlier erronously labeled as heulandite (Lefevre & Thomas (1998).
Reference: Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)
Columbite-(Mn)
Formula: Mn2+Nb2O6
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de doctorat de L'Universite Paul Sabatier, Toulouse
Danburite
Formula: CaB2Si2O8
Habit: Crystals 1-2 cm in diameter (A.Lacroix 1912); masses
Colour: rose-yellow (A.Lacroix 1912)
Reference: [MinRec 33:165]/ Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Colour: pink, green, brown
Description: See comments under tourmaline entry at Antandrokomby locality page. Ranorosoa (1986, 1989) analyzes pink,green and brownish colored tourmaline found in the contactzone and she find these to be elbaite, one an elbaite with 2,44wt% MnO. The brown colored gave this formula Na0,52Ca0,38)0,90(Li1,45Mn0,34Fe0,08Al1,77)3,64Al6,00(BO3)3,00Si6,00O18(OH3,63F0,09)3,72. Simmons et al (2001) states that tourmalines from Antandrokomby are members of the schorl-elbaite series with significant Mg and Ca contents.
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.
'Elbaite-Schorl Series'
Reference: Nizamoff, J.W.; Falster, A.U.; Pezzota, F. ; Simmons, W.B.; Hanson, S.L. and Webber, K.L. (2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000. ; Simmons, W.B., Webber, K.L., Falster, A.U., & Nizamoff, J. W. (2001): Gem tourmaline chemistry and paragenesis. Australian gemmologist 21, number 01
Fluor-liddicoatite
Formula: Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
Description: RRUFF Identification has only been confirmed by single-crystal X-ray diffraction (Red part of red and green prismatic xls) see http://rruff.info/liddicoatite/display=default/R060969
Reference: RRUFF ID: R060969
Hambergite
Formula: Be2(BO3)(OH)
Habit: small, prismatic crystals
Colour: white to colorless
Reference: Extra Lapis nr 17. Madagascar p 54 (german edition); Nizamoff, J.W. et al.(2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000
'Heulandite subgroup'
Description: Described by LeFevre & Thomas as heulandite but later showed to actually be clinoptilolite (Pezzotta 1999)
Reference: Lefevre, M. & Thomas, L. (1998): Les pegmatites de la vallée de la Sahatany, Madagascar. Le Règne Minéral no 19, 15-28
Hübnerite
Formula: MnWO4
Reference: Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition); Biagioni, C., Meisser, N., Nestola, F., Pasero, M., Bobyr, M., Roth, P., Schnyder, C., Gieré, R. (2018): Hydrokenopyrochlore, (□,#)2Nb2O6·H2O, a new species of the pyrochlore supergroup from the Sahatany Pegmatite Field, Antananarivo Province, Madagascar. European Journal of Mineralogy, 30: 869-876
Hydrokenopyrochlore (TL)
Formula: (□,□)2Nb2O6·H2O
Type Locality:
Reference: Biagioni, C., Gieré, R.,Meisser, N., Nestola, F., Pasero, M., Robyr, M., Roth, P. and Schnyder, C. (2017) Hydrokenopyrochlore, IMA 2017-005. CNMNC Newsletter No. 37, June 2017, page 739; Mineralogical Magazine, 81, 737–742; Biagioni, C., Meisser, N., Nestola, F., Pasero, M., Bobyr, M., Roth, P., Schnyder, C., Gieré, R. (2018): Hydrokenopyrochlore, (□,#)2Nb2O6·H2O, a new species of the pyrochlore supergroup from the Sahatany Pegmatite Field, Antananarivo Province, Madagascar. European Journal of Mineralogy, 30, 869-876
Hydroxykenomicrolite
Formula: (◻,Na,Sb3+)2Ta2O6(OH)
Reference: C. Stefano photo & Specimen -obtained from Al Falster
'Liddicoatite' ?
Formula: Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Colour: Red
Description: It is stated in Pezzotta et al (1997) without any further analysis that the red and green tourmaline at Antandrokomby are mainly liddicoatite. In Pezzotta (1999), p 53 (german version) there is a picture of red crystals with greenish core (from a miarolitic cavity), and the accompanying texts calls these "crystals of elbaite-liddicoatite"- this is not reflected in the book text though.
Reference: Pezzotta F., Falster A.U., Simmons W.B. & Webber K.L. (1997): Rhodizite from Madagascar, new localities and new chemical data. Abstracts of the First International Workshop on Petrology, Milan, Italy, September 11 to 13, 1997, Mus. Storia Nat. Sc. Nat.;
Londonite (TL)
Formula: (Cs,K,Rb)Al4Be4(B,Be)12O28
Type Locality:
Habit: Dodecahedron {110}, tristetrahedron {211}, tetrahedron{111} and cube {100} (the last form is rare}
Colour: Milky to pale yellow crystals up to 1 cm
Description: Occurs in saccharoidal albite or in cavities. Many crystals contain patchy zones of londonite and rhodizite that are only visible by back-scattered electron imaging.
Reference: Simmons, W. B; Pezzotta, F; Falster, A.U & Webber, K. L. (2001): Londonite, a new mineral species: The Cs-dominant analogue of Rhodizite from the Antandrokomby granitic pegmatite, Madagascar. Canadian Mineralogist 39: 747-755/ MinRec 33:165]
'Londonite-Rhodizite Series'
Reference: Knut Edvard Larsen collection; Simmons, W.B., F. Pezzotta, A.U. Falster, and K.L. Webber (2001) Londonite, a new mineral species: the Cs-dominant analogue of rhodizite from the Antandrokomby granitic pegmatite, Madagascar. Canadian Mineralogist (2001): 39: 747-755.
Manandonite (TL)
Formula: Li2Al4(Si2AlB)O10(OH)8
Type Locality:
Habit: Flakes (sometimes with hexagonal contours)in fanlike globular aggregates
Colour: white
Description: white flakes with pearly lustre on the (001) cleavage.
Reference: Lacroix, A. (1912): Sur une nouvelle espèce minérale (manandonite) des pegmatites de Madagascar. Bulletin de la Société française de Minéralogie, 35, 223-226; Ranorosoa, N. , Fontan, F. & Fransolet, A-M. (1989): Rediscovery of manandonite in the Sahatany Valley, Madagascar. European Journal of Mineralogy 1, 633-638
Microcline
Formula: K(AlSi3O8)
Habit: crude crystals up to 6 cm
Colour: pale grey
Reference: [MinRec 33:165]/ Nizamoff, J.W. et al.(2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000
'Microlite Group'
Formula: A2-mTa2X6-wZ-n
Habit: rounded crystals
Colour: bright yellow
Description: uraniferous
Reference: Nizamoff, J.W. et al.(2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000
'Microlite Group var: Uranmicrolite (of Hogarth 1977)'
Description: Spelled as uranomikrolith in Pezzotta (1999)
Reference: Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)
Monazite-(Ce)
Formula: Ce(PO4)
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Opal
Formula: SiO2 · nH2O
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Orthoclase
Formula: K(AlSi3O8)
Reference: Biagioni, C., Meisser, N., Nestola, F., Pasero, M., Bobyr, M., Roth, P., Schnyder, C., Gieré, R. (2018): Hydrokenopyrochlore, (□,#)2Nb2O6·H2O, a new species of the pyrochlore supergroup from the Sahatany Pegmatite Field, Antananarivo Province, Madagascar. European Journal of Mineralogy, 30, 869-876
Quartz
Formula: SiO2
Reference: Ranorosoa, N. , Fontan, F. & Fransolet, A-M. (1989): Rediscovery of manandonite in the Sahatany Valley, Madagascar. European Journal of Mineralogy 1, 633-638
Rhodizite
Formula: (K,Cs)Al4Be4(B,Be)12O28
Habit: Well-formed crystals from a few mm to 1,5 cm
Colour: colorless, white to pale greenish-yellow
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p ; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 330; Canadian Mineralogist (2001): 39: 747-755.
'Rubellite'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Colour: red
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Scheelite
Formula: Ca(WO4)
Reference: Extra Lapis nr 17. Madagascar p 54 (german edition); Nizamoff, J.W. et al.(2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Tourmalines from Antandrokomby are members of the schorl-elbaite series with significant Mg and Ca contents.
Reference: Australian Gemmologist, Vol 21 (2001) nr 1
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
Spodumene
Formula: LiAlSi2O6
Habit: masses to 10 cm
Colour: pink to pale green
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 330.
Stibiotantalite
Formula: Sb(Ta,Nb)O4
Reference: Biagioni, C., Meisser, N., Nestola, F., Pasero, M., Bobyr, M., Roth, P., Schnyder, C., Gieré, R. (2018): Hydrokenopyrochlore, (□,#)2Nb2O6·H2O, a new species of the pyrochlore supergroup from the Sahatany Pegmatite Field, Antananarivo Province, Madagascar. European Journal of Mineralogy, 30: 869-876
'Tantalite'
Formula: (Mn,Fe)(Ta,Nb)2O6
Description: Probably Tantalite-(Mn) ?
Reference: Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)
'Tourmaline'
Formula: A(D3)G6(Si6O18)(BO3)3X3Z
Colour: red, pale rose, green; reddish-purple; dark-olive brown
Description: Nizamoff et al (2000) describes 3 types of tourmalines found at Antandrokomby : Type I: prismatic zonated crystals up to 30 cm with dark-olive-brown core and thin dark-red rim. These were found mostly in the massive pegmatite (and which rarely protruded into the pockets). Type II: stubby, zoned, reddish-purple up to 4 cm with dark-olive brown cores and dark red rims (found in miarolitic pockets) Type III: Vibrant pink unzoned crystals less than 2 mm which forms masses of fibrous crystals. Nizamoff et al. (2000) further states that the types I and II from Antandrokomby have dark brown cores that are schorlitic in composition. Weber et al (2002) further states: " Electron microprobe analyses reveal that the tourmalines are not liddicoatite, but principally schorl to elbaite in composition". Ranorosoa (1986) analyzes pink, green and brownish tourmaline found at the pegmatite contactzone (equal to Nizamoff et al.'s type I) and find it to be elbaite in composition (Look under elbaite for further info)
Reference: Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 330.; - Nizamoff, J.W.; Falster, A.U.; Pezzota, F. ; Simmons, W.B.; Hanson, S.L. and Webber, K.L. (2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000
Xenotime-(Y)
Formula: Y(PO4)
Habit: tiny grains
Reference: Nizamoff, J.W. et al.(2000): Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, july 2000

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Arsenic1.CA.05As
Bismuth1.CA.05Bi
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Columbite-(Mn)4.DB.35Mn2+Nb2O6
Hydroxykenomicrolite4.DH.(◻,Na,Sb3+)2Ta2O6(OH)
Hübnerite4.DB.30MnWO4
'Microlite Group'4.00.A2-mTa2X6-wZ-n
'var: Uranmicrolite (of Hogarth 1977)'4.00.A2-mTa2X6-wZ-n
Opal4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
Stibiotantalite4.DE.30Sb(Ta,Nb)O4
Group 6 - Borates
Béhierite6.AC.15(Ta5+,Nb5+)(BO4)
Hambergite6.AB.05Be2(BO3)(OH)
Londonite (TL)6.GC.05(Cs,K,Rb)Al4Be4(B,Be)12O28
Rhodizite6.GC.05(K,Cs)Al4Be4(B,Be)12O28
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Group 8 - Phosphates, Arsenates and Vanadates
Autunite ?8.EB.05Ca(UO2)2(PO4)2 · 11H2O
Brockite8.CJ.45(Ca,Th,Ce)PO4 · H2O
Clinobisvanite8.AD.65Bi(VO4)
Monazite-(Ce)8.AD.50Ce(PO4)
Xenotime-(Y)8.AD.35Y(PO4)
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Cleavelandite9.FA.35Na(AlSi3O8)
Beryl9.CJ.05Be3Al2(Si6O18)
Danburite9.FA.65CaB2Si2O8
Elbaite9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Fluor-liddicoatite9.CK.05Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
'Liddicoatite' ?9.CK.05Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Manandonite (TL)9.ED.15Li2Al4(Si2AlB)O10(OH)8
Microcline9.FA.30K(AlSi3O8)
Orthoclase9.FA.30K(AlSi3O8)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spessartine9.AD.25Mn2+3Al2(SiO4)3
Spodumene9.DA.30LiAlSi2O6
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Clinoptilolite'-
'Elbaite-Schorl Series'-
'Heulandite subgroup' ?-
Hydrokenopyrochlore (TL)-(□,□)2Nb2O6·H2O
'Londonite-Rhodizite Series'-
'Rubellite'-A(D3)G6(T6O18)(BO3)3X3Z
'Tantalite'-(Mn,Fe)(Ta,Nb)2O6
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Arsenic1.3.1.1As
Bismuth1.3.1.4Bi
Group 4 - SIMPLE OXIDES
AX2
Anatase4.4.4.1TiO2
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Stibiotantalite8.1.6.2Sb(Ta,Nb)O4
A2B2O6(O,OH,F)
'Microlite Group'8.2.2.1A2-mTa2X6-wZ-n
AB2O6
Columbite-(Mn)8.3.2.4Mn2+Nb2O6
Group 24 - ANHYDROUS BORATES
A2XO4
Béhierite24.1.2.1(Ta5+,Nb5+)(BO4)
Group 25 - ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
Monoborates
Hambergite25.1.1.1Be2(BO3)(OH)
Miscellaneous
Rhodizite25.8.2.1(K,Cs)Al4Be4(B,Be)12O28
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO4
Clinobisvanite38.4.7.1Bi(VO4)
Monazite-(Ce)38.4.3.1Ce(PO4)
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Autunite ?40.2a.1.1Ca(UO2)2(PO4)2 · 11H2O
(AB)5(XO4)2·xH2O
Brockite40.4.7.5(Ca,Th,Ce)PO4 · H2O
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Hübnerite48.1.1.1MnWO4
Scheelite48.1.2.1Ca(WO4)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Spessartine51.4.3a.3Mn2+3Al2(SiO4)3
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)
Six-Membered Rings with borate groups
Elbaite61.3.1.8Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
'Liddicoatite' ?61.3.1.2Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Spodumene65.1.4.1LiAlSi2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Manandonite (TL)71.1.2c.6Li2Al4(Si2AlB)O10(OH)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Albite
var: Cleavelandite
-Na(AlSi3O8)
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Clinoptilolite'-
'Elbaite-Schorl Series'-
Fluor-liddicoatite-Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
'Heulandite subgroup' ?-
Hydrokenopyrochlore (TL)-(□,□)2Nb2O6·H2O
Hydroxykenomicrolite-(◻,Na,Sb3+)2Ta2O6(OH)
Londonite (TL)-(Cs,K,Rb)Al4Be4(B,Be)12O28
'Londonite-Rhodizite Series'-
'Microlite Group
var: Uranmicrolite (of Hogarth 1977)'
-A2-mTa2X6-wZ-n
'Rubellite'-A(D3)G6(T6O18)(BO3)3X3Z
'Tantalite'-(Mn,Fe)(Ta,Nb)2O6
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z
Xenotime-(Y)-Y(PO4)

List of minerals for each chemical element

HHydrogen
H ManandoniteLi2Al4(Si2AlB)O10(OH)8
H Hydrokenopyrochlore(□,□)2Nb2O6·H2O
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
H HambergiteBe2(BO3)(OH)
H Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H OpalSiO2 · nH2O
H ApatiteCa5(PO4)3(Cl/F/OH)
H Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)
H Brockite(Ca,Th,Ce)PO4 · H2O
H LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
H AutuniteCa(UO2)2(PO4)2 · 11H2O
LiLithium
Li ManandoniteLi2Al4(Si2AlB)O10(OH)8
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Li Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
Li SpodumeneLiAlSi2O6
Li LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
BeBeryllium
Be Londonite(Cs,K,Rb)Al4Be4(B,Be)12O28
Be Rhodizite(K,Cs)Al4Be4(B,Be)12O28
Be HambergiteBe2(BO3)(OH)
Be BerylBe3Al2(Si6O18)
BBoron
B Londonite(Cs,K,Rb)Al4Be4(B,Be)12O28
B ManandoniteLi2Al4(Si2AlB)O10(OH)8
B Rhodizite(K,Cs)Al4Be4(B,Be)12O28
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
B DanburiteCaB2Si2O8
B HambergiteBe2(BO3)(OH)
B Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B Béhierite(Ta5+,Nb5+)(BO4)
B RubelliteA(D3)G6(T6O18)(BO3)3X3Z
B LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O Londonite(Cs,K,Rb)Al4Be4(B,Be)12O28
O ManandoniteLi2Al4(Si2AlB)O10(OH)8
O Hydrokenopyrochlore(□,□)2Nb2O6·H2O
O Rhodizite(K,Cs)Al4Be4(B,Be)12O28
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
O QuartzSiO2
O MicroclineK(AlSi3O8)
O DanburiteCaB2Si2O8
O AlbiteNa(AlSi3O8)
O HambergiteBe2(BO3)(OH)
O Columbite-(Mn)Mn2+Nb2O6
O Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O SpodumeneLiAlSi2O6
O Tantalite(Mn,Fe)(Ta,Nb)2O6
O Béhierite(Ta5+,Nb5+)(BO4)
O RubelliteA(D3)G6(T6O18)(BO3)3X3Z
O SpessartineMn32+Al2(SiO4)3
O BerylBe3Al2(Si6O18)
O HübneriteMnWO4
O ScheeliteCa(WO4)
O ClinobisvaniteBi(VO4)
O Monazite-(Ce)Ce(PO4)
O OpalSiO2 · nH2O
O AnataseTiO2
O Xenotime-(Y)Y(PO4)
O ApatiteCa5(PO4)3(Cl/F/OH)
O Albite (var: Cleavelandite)Na(AlSi3O8)
O Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)
O Brockite(Ca,Th,Ce)PO4 · H2O
O OrthoclaseK(AlSi3O8)
O StibiotantaliteSb(Ta,Nb)O4
O LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
O AutuniteCa(UO2)2(PO4)2 · 11H2O
FFluorine
F Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
F ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Na AlbiteNa(AlSi3O8)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na Albite (var: Cleavelandite)Na(AlSi3O8)
Na Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)
AlAluminium
Al Londonite(Cs,K,Rb)Al4Be4(B,Be)12O28
Al ManandoniteLi2Al4(Si2AlB)O10(OH)8
Al Rhodizite(K,Cs)Al4Be4(B,Be)12O28
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
Al Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpodumeneLiAlSi2O6
Al SpessartineMn32+Al2(SiO4)3
Al BerylBe3Al2(Si6O18)
Al Albite (var: Cleavelandite)Na(AlSi3O8)
Al OrthoclaseK(AlSi3O8)
Al LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si ManandoniteLi2Al4(Si2AlB)O10(OH)8
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
Si QuartzSiO2
Si MicroclineK(AlSi3O8)
Si DanburiteCaB2Si2O8
Si AlbiteNa(AlSi3O8)
Si Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si SpodumeneLiAlSi2O6
Si SpessartineMn32+Al2(SiO4)3
Si BerylBe3Al2(Si6O18)
Si OpalSiO2 · nH2O
Si Albite (var: Cleavelandite)Na(AlSi3O8)
Si OrthoclaseK(AlSi3O8)
Si LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
PPhosphorus
P Monazite-(Ce)Ce(PO4)
P Xenotime-(Y)Y(PO4)
P ApatiteCa5(PO4)3(Cl/F/OH)
P Brockite(Ca,Th,Ce)PO4 · H2O
P AutuniteCa(UO2)2(PO4)2 · 11H2O
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K Rhodizite(K,Cs)Al4Be4(B,Be)12O28
K MicroclineK(AlSi3O8)
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca DanburiteCaB2Si2O8
Ca Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
Ca ScheeliteCa(WO4)
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca Brockite(Ca,Th,Ce)PO4 · H2O
Ca LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Ca AutuniteCa(UO2)2(PO4)2 · 11H2O
TiTitanium
Ti AnataseTiO2
VVanadium
V ClinobisvaniteBi(VO4)
MnManganese
Mn Columbite-(Mn)Mn2+Nb2O6
Mn Tantalite(Mn,Fe)(Ta,Nb)2O6
Mn SpessartineMn32+Al2(SiO4)3
Mn HübneriteMnWO4
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Tantalite(Mn,Fe)(Ta,Nb)2O6
AsArsenic
As ArsenicAs
YYttrium
Y Xenotime-(Y)Y(PO4)
NbNiobium
Nb Hydrokenopyrochlore(□,□)2Nb2O6·H2O
Nb Columbite-(Mn)Mn2+Nb2O6
Nb Tantalite(Mn,Fe)(Ta,Nb)2O6
SbAntimony
Sb Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)
Sb StibiotantaliteSb(Ta,Nb)O4
CsCaesium
Cs Londonite(Cs,K,Rb)Al4Be4(B,Be)12O28
CeCerium
Ce Monazite-(Ce)Ce(PO4)
Ce Brockite(Ca,Th,Ce)PO4 · H2O
TaTantalum
Ta Tantalite(Mn,Fe)(Ta,Nb)2O6
Ta Béhierite(Ta5+,Nb5+)(BO4)
Ta Microlite GroupA2-mTa2X6-wZ-n
Ta Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)
Ta StibiotantaliteSb(Ta,Nb)O4
WTungsten
W HübneriteMnWO4
W ScheeliteCa(WO4)
BiBismuth
Bi BismuthBi
Bi ClinobisvaniteBi(VO4)
ThThorium
Th Brockite(Ca,Th,Ce)PO4 · H2O
UUranium
U AutuniteCa(UO2)2(PO4)2 · 11H2O

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

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Dabren A. (1906) Sur quelques pierres précieuses de Madagascar. Bulletin de L'Académie Malgache. Tananarive, 4:132-137 [First find of spodumene from Antandrokomby].
Lacroix, A. (1908) Les minéraux des filons de pegmatite á tourmaline lithique de Madagascar. Bulletin de la Société française de Minéralogie 31: 218-247.
Duparc, L., Wunder, M., and Sabot, R. (1910) Les minéraux des pegmatites des environs d´Antsirabe á Madagscar. Mémoires de la Société de Physique et d'Histoire Naturelle de Geneve 36: 3: 283-407.
Lacroix, A. (1912) Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris 35: 76-84 [on danburite and rhodizite].
Lacroix, A. (1912) Sur une nouvelle espèce minérale (manandonite) des pegmatites de Madagascar. Bulletin de la Société française de Minéralogie 35: 223-226.
Lacroix, A. (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. 624p.
Behier, J. (1963) Carte minéralogique de Madagascar. Archive Service Géologique Madagascar. A 1871.
Ranorosoa, N., Fontan, F., and Fransolet, A-M. (1989) Rediscovery of manandonite in the Sahatany Valley, Madagascar. European Journal of Mineralogy 1: 633-638.
Ranorosoa, N. (1986) Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar. Thèse de doctorat de L'Université Paul Sabatier, Toulouse.
Zheng, H. and Bailey, S.W. (1995) The crystal structure of manandonite-2H2. American Mineralogist 80: 387-393.
Pezzotta F., Falster A.U., Simmons W.B., and Webber K.L. (1997) Rhodizite from Madagascar, new localities and new chemical data. Abstracts of the First International Workshop on Petrology, Milan, Italy, September 11 to 13, 1997, Mus. Storia Nat. Sc. Nat.
Pezzotta, F. (1999) Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 [German edition].
Nizamoff, J.W., Falster, A.U., Pezzota, F., Simmons, W.B., Hanson, S.L., and Webber, K.L. (2000) Recent mining at the Antandrokomby pegmatite, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, July 2000.
Nizamoff, J.W., Falster, A.U., Pezzota, F., Simmons, W.B., and Webber, K.L. (2000) Geochemical variation in tourmaline from Antandrokomby, Madagascar. 26th Rochester Mineralogical Symposium. Rocks & Minerals, July 2000.
Simmons, W.B., Pezzotta, F., Falster, A.U., and Webber, K.L. (2001) Londonite, a new mineral species: The Cs-dominant analogue of Rhodizite from the Antandrokomby granitic pegmatite, Madagascar. Canadian Mineralogist 39: 747-755.
Simmons, W.B., Webber, K.L., Falster, A.U., and Nizamoff, J.W. (2001) Gem tourmaline chemistry and paragenesis. Australian Gemmologist 21: number 01.
Webber, K.L. Simmons, W.B., and Falster, A.U. (2002) Tourmaline from the Antandrokomby and Fianarantsoa Pegmatites, Madagascar. Mineralogical Record 33: 82.
Pezzotta, F., Diella, V., and Demartin, F. (2003) Londonit aus Madagaskar-eine neue Mineralart. Lapis 35(2): 35-38.
Yongkil Ahn, Jingyo Seo, and Jongwan Park (2013) Electronic and vibrational spectra of tourmaline – The impact of electron beam irradiation and heat treatment. Vibrational Spectroscopy 65: 165-175 [Samples from Antandrokomby used in the study].
Frost, Ray L., López, Andrés, Xi, Yunfei, Scholz, Ricardo, Souza, Larissa, and Lana, Cristiano (2014) The molecular structure of the borate mineral rhodizite (K, Cs)Al4Be4(B, Be)12O28 – A vibrational spectroscopic study. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 128: 291-294. [Sample from Antandrokomby used in the study].
Biagioni, C., Meisser, N., Nestola, F., Pasero, M., Bobyr, M., Roth, P., Schnyder, C., Gieré, R. (2018): Hydrokenopyrochlore, (□,#)2Nb2O6·H2O, a new species of the pyrochlore supergroup from the Sahatany Pegmatite Field, Antananarivo Province, Madagascar. European Journal of Mineralogy, 30: 869-876


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