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Manjaka (Ampatika; Sahananana), Sahatany Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar
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 | |
| 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 | ||
| 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. | |
| 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 photo & collection | |
| 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,Mn3+]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: | LiAl4(BSi3O10)(OH)6 | |
| 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 | |
| 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: | t Edvard Larsen collection (MM # 1517) | |
| ' | ||
| 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 | ||
26 entries listed. 18 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
- 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]
- 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
- 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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