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Manjaka (Ampatika; Sahananana), Sahatany Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar
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Detailed Mineral List:
Albite
Formula: NaAlSi3O8
Reference: Lacroix, A. (1912): Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris 35 , 76-84
Behierite (TL)
Formula: (Ta5+,Nb5+)(BO4)
Type Locality: Manjaka (Ampatika; Sahananana), Sahatany Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar
Habit: Octahedral crystals
Colour: Grayish-pink
Reference: Mrose, M.E. & Rose jr, J. (1961): Behierite, (Ta, Nb)BO4, a new mineral from Manjaka, Madagascar. Geol.Soc.Am, Abstracts 1961 Ann. Meetings, p 111A
Photo: © K.E.Larsen. Behierite from Manjaka, Sahatany Valley, Sahatany Pegmatite Field, Vakinankaratra Region, Antananarivo Province, Madagascar
Beryl
Formula: Be3Al2(Si6O18)
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: Knut Edvard Larsen collection # MM-5549
Bismutite ?
Formula: (BiO)2CO3
Description: As alteration product of bismuth
Reference: Knut Edvard Larsen collection # MM-5549, only visually determined.
Bityite
Formula: LiCaAl2(AlBeSi2O10)(OH)2
Habit: xls up to 1mm in diameter and 2 mm in length
Colour: colorless
Description: Found in a cavity in microcline
Reference: Behier, J (1953): Les mineraux de la pegmatite de Manjaka, Vallee de la Sahatany. Archive Service Gélogique Madagascar. A.581
Photo: © Elmar Lackner. Bityite from Manjaka, Sahatany Valley, Sahatany Pegmatite Field, Vakinankaratra Region, Antananarivo Province, Madagascar
Calcite
Formula: CaCO3
Reference: Knut Edvard Larsen collection # MM-5119
Columbite-(Mn)
Formula: (Mn,Fe)(Nb,Ta)2O6
Description: A. Lacroix (1912,1922) described columbite-(Mn)(Manganocolumbite) from Manjaka,using only visual means for analysis. Later von Knorring and Fadipe (1981)analyzes columbite-(Mn) from Manjaka and find that it is a tungstenian variety. Also as partially alteration of behierite (Pezzotta 2007)
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. p 370/ Bull.Minéral. (1981), 104, p.496-507
Photo: © K.E.Larsen. Columbite-(Mn) from Manjaka, Sahatany Valley, Sahatany Pegmatite Field, Vakinankaratra Region, Antananarivo Province, Madagascar
Danburite
Formula: CaB2Si2O8
Reference: Knut Edvard Larsen collection # M-639; Pavel M. Kartashov collection and photo.
Photo: © Pavel M. Kartashov. Danburite from Manjaka, Sahatany Valley, Sahatany Pegmatite Field, Vakinankaratra Region, Antananarivo Province, Madagascar
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Description: Described as a Mn-rich elbaite (elbaite manganésière) by 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
Fluorapatite var: Mn-bearing Fluorapatite
Formula: (Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
Habit: Small, mostly mm-sized hexagonal prismes
Colour: prusse blue
Description: Called "apatite manganiésifère" or "manganapatite" in litterature.
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. p 353
Photo: © M Arliguie. Mn-bearing Fluorapatite from Manjaka, Sahatany Valley, Sahatany Pegmatite Field, Vakinankaratra Region, Antananarivo Province, Madagascar
Ixiolite var: Wolframoixiolite
Formula: (Nb,W,Ta,Fe,Mn,Nb)2O4
Description: (Mn1,63Ta1,10W0,79Nb0,50)4,02 O8 (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
Lepidolite
Reference: Mrose, M.E. & Rose jr, J. (1961): Behierite, (Ta, Nb)BO4, a new mineral from Manjaka, Madagascar. Geol.Soc.Am, Abstracts 1961 Ann. Meetings, p 111A
Lithiophilite
Formula: LiMn2+PO4
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de doctorat de L'Universite Paul Sabatier, Toulouse
Manandonite
Formula: Li2Al4(Si2AlB)O10(OH)8
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de doctorat de L'Universite Paul Sabatier, Toulouse
Microcline
Formula: KAlSi3O8
Reference: Behier, J (1953): Les mineraux de la pegmatite de Manjaka, Vallee de la Sahatany. Archive Service Gélogique Madagascar. A.581
Microlite Group
Description: As partially alteration of behierite
Reference: Pezzotta, F.(2007): Ta-Nb borates and other rare accessory phases in granitic pegmatites of the Itremo region, central Madagascar. Norsk Bergverksmuseum Skrift. 35,97-98
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
Pollucite
Formula: (Cs,Na)2(Al2Si4O12) · 2H2O
Description: corroded
Reference: Behier, J. (1960): Contribution á la mineralogie de Madagascar. Annales Géologiques de Madagascar XXIX, Tananarive
'Psilomelane'
Description: alteration of spessartine and perhaps also of columbite-(Mn) (Behier 1953)
Reference: Behier, J (1953): Les mineraux de la pegmatite de Manjaka, Vallee de la Sahatany. Archive Service Gélogique Madagascar. A.581
'Pyrochlore Supergroup'
Formula: A2-mD2X6-wZ1-n
Reference: Knut Edvard Larsen collection (MM # 1517)
'Pyrochlore Supergroup var: Betafite (of Hogarth 1977)'
Description: Behier (1953) describes small brown strongly refrigent crystals as "blomstrandite". Visual examination of the specimens collected by J. Behier and labelled blomstrandite, Manjaka in the Musée National de la Geologie at Ampandrianomby in Antananarivo, Madagascar is very similar to what later has been proved to be a hafinan zircon (per. com. Knut Edvard Larsen 1997)
Reference: Behier, J (1953): Les mineraux de la pegmatite de Manjaka, Vallee de la Sahatany. Archive Service Gélogique Madagascar. A.581
Quartz
Formula: SiO2
Reference: Behier, J (1953): Les mineraux de la pegmatite de Manjaka, Vallee de la Sahatany. Archive Service Gélogique Madagascar. A.581
Rhodizite
Formula: (K,Cs)Al4Be4(B,Be)12O28
Habit: Up to 2 cm large well developed dodecahedral crystals modified by tetrahedron {111} faces
Colour: Pale to honey yellow; colorless. Transparent to translucent
Description: Occurs in saccharoidal albite close to the contact with the hosting marble, and in miarolitic cavities.
Reference: Lacroix, A. (1912): Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris 35 , 76-84
Spessartine
Formula: Mn2+3Al2(SiO4)3
Reference: Behier, J (1953): Les mineraux de la pegmatite de Manjaka, Vallee de la Sahatany. Archive Service Gélogique Madagascar. A.581
Spodumene
Formula: LiAlSi2O6
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p.
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Ranorosoa, N (1986) : Etude mineralogique des pegmatites du champ de la Sahatany, Madagscar. These de doctorat, Toulouse
'Tourmaline var: Rubellite'
Reference: Lacroix, A. (1912): Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris 35 , 76-84
Photo: © Arliguie M. Rubellite from Manjaka, Sahatany Valley, Sahatany Pegmatite Field, Vakinankaratra Region, Antananarivo Province, Madagascar
Zircon
Formula: ZrSiO4
Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de doctorat de L'Universite Paul Sabatier, Toulouse
Zircon var: Hafnian Zircon
Formula: (Zr,Hf)SiO4
Reference: K.E.Larsen collection, analyzed (XRD) by Skip Simmons 1999
Photo: © K.E.Larsen. Hafnian Zircon from Manjaka, Sahatany Valley, Sahatany Pegmatite Field, Vakinankaratra Region, Antananarivo Province, Madagascar


30 entries listed. 22 valid minerals. 1 type locality (valid mineral). 1 erroneous literature entry.

References

Duparc, L., Wunder, M. & Sabot , R. (1911): Contribution á la connaissance des minéraux de Madagascar. 2e note. Bulletin de la Société française de Minéralogie, Paris 34, 131-134. (on rhodizite p. 136-138)

Lacroix, A. (1912): Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris 35 , 76-84

Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. 624p

Behier, J (1953): Les mineraux de la pegmatite de Manjaka, Vallee de la Sahatany. Archive Service Gélogique Madagascar. A.581

Behier, J. (1960): Travaux mineralogiques. Rapport Annuel 1960 Service Géologiques, Rep. Malgache., Tananarive. 186-187 [Abstract in American Mineralogist 46 (1961), 767-8]

Mrose, M.E. & Rose jr, J. (1961): Behierite, (Ta, Nb)BO4, a new mineral from Manjaka, Madagascar. Geol. Soc. Am, Abstracts 1961 Ann. Meetings, p 111A. [abstract in American Mineralogist 47 (1962), 414]

Behier, J. (1962): Travaux mineralogiques. Rapport Annuel 1962 Service Géologiques, Rep. Malgache., Tananarive. p 257

Frondel, C. & Ito, J. (1965): Composition of Rhodizite. Tschermaks mineralogische und petrographische Mitteilungen 10, (1-4):409-412 [Chemical analysis of rhodizite from Manjaka]

Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de doctorat de L'Universite Paul Sabatier, Toulouse

Ertl, A. & Tillmanns, E. (2008): Al- and B-rich tourmaline from the Sahatany Pegmatite Field, Madagascar and its relevance on a new barometer. Goldschmidt 2008 Conferance Abstract A 247

Pezzotta, F.(2007): Ta-Nb borates and other rare accessory phases in granitic pegmatites of the Itremo region, central Madagascar. Norsk Bergverksmuseum Skrift. 35,97-98 [with notes of alteration of behierite from Manjaka]

Ertl, A., Tillmanns, E., Ntaflos, T., Francis, C., Giester, G., Körner, W. Hughes, J. M. Lengauer, C. & Prem, M. (2008): Tetrahedrally coordinated boron in Al-rich tourmaline and its relationship to the pressure-temperature conditions of formation. European Journal of Mineralogy. 20: 881-888 [sample from Manjaka used in the study]

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