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fluorcalciomicrolite

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Journal Article

Fluorcalciomicrolite, (Ca,Na,□) 2 Ta 2 O 6 F, a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil

M. B. Andrade, D. Atencio, A. I. C. Persiano, J. Ellena
Published: 01 October 2013
Mineralogical Magazine (2013) 77 (7): 2989–2996.
DOI: https://doi.org/10.1180/minmag.2013.077.7.08
...M. B. Andrade; D. Atencio; A. I. C. Persiano; J. Ellena Abstract Fluorcalciomicrolite, (Ca,Na,□) 2 Ta 2 O 6 F, is a new microlite-group, pyrochlore supergroup mineral approved by the CNMNC (IMA 2012-036). It occurs as an accessory mineral in the Volta Grande pegmatite, Nazareno, Minas Gerais...
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View PDF for article title, <span class="search-highlight">Fluorcalciomicrolite</span>, (Ca,Na,□) 2 Ta 2 O 6 F, a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil
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BSE images of the mineral assemblages. (a) Euhedral zircon associated with columbite-(Mn) and fersmite, fluorcalciomicrolite, thortveitite and titanite. (b) and (c) Corroded relics of columbite replaced by fersmite and overgrown by euhedral crystals of nioboheftetjernite. (d) Complexly altered fluorcalciomicrolite with rare thin bright veinlets of Pb-enriched fluorcalciomicrolite. The microlite fills open spaces in older mineralisation dominated by columbite-(Mn) and fersmite (dark grey). Note the feeder structure connecting two microlite aggregates. (e) Kristiansenite veinlet traversing the columbite-(Mn) + fersmite aggregates. Note also a small brighter crystal of nioboheftetjernite. (f) Oscillatory zoned grain of titanite. Zrn – zircon, Clb – columbite-(Mn), Fsm – fersmite, Mic – fluorcalciomicrolite, Tvt – thortveitite, Ttn – titanite, Kse – kristiansenite, Nhef – nioboheftetjernite.

BSE images of the mineral assemblages. (a) Euhedral zircon associated with ...

Published: 01 December 2024
Figure 2. BSE images of the mineral assemblages. (a) Euhedral zircon associated with columbite-(Mn) and fersmite, fluorcalciomicrolite, thortveitite and titanite. (b) and (c) Corroded relics of columbite replaced by fersmite and overgrown by euhedral crystals of nioboheftetjernite. (d) Complexly
Image
Examples of fluornatromicrolite and “fluorcalciomicrolite” compositions according to the occupancy of the A-cation position. Symbols: ■ fluornatromicrolite, Quixaba, Brazil (this work), □ fluornatromicrolite, Altai Mountains, Russia (Zalashkova &amp; Kucharchik 1957), ▴ fluornatromicrolite, Borborema pegmatitic province, Brazil (Beurlen et al. 2005), ▵ “fluorcalciomicrolite”, Harding pegmatite, New Mexico, U.S.A. (Lumpkin et al. 1986), • “fluorcalciomicrolite”, Koktogai, China (Borodin &amp; Nazarenko 1957), ○ “fluorcalciomicrolite”, Nazareno, Minas Gerais, Brazil (Pinto 2000).

Examples of fluornatromicrolite and “fluorcalciomicrolite” compositions acc...

Published: 01 August 2011
Fig. 2 Examples of fluornatromicrolite and “fluorcalciomicrolite” compositions according to the occupancy of the A-cation position. Symbols: ■ fluornatromicrolite, Quixaba, Brazil (this work), □ fluornatromicrolite, Altai Mountains, Russia ( Zalashkova & Kucharchik 1957
Journal Article

Complex Nb-ta-ti-sn Oxide Mineral Intergrowths in the La Calandria Pegmatite, CaÑada Del Puerto, CÓrdoba, Argentina

Miguel Ángel Galliski, María Florencia MÁrquez-ZavalÍa, Petr ČernÝ, Raúl Lira
Published: 01 July 2016
The Canadian Mineralogist (2016) 54 (4): 899–916.
DOI: https://doi.org/10.3749/canmin.1500095
..., columbite-(Mn), ixiolite, and fluorcalciomicrolite. The chemical composition of these phases is variable, but in general the minerals show slight predominance of Nb over Ta and a clearly defined predominance of Fe over Mn, with minor participation of Ti, Sn, and W. The minerals in this assemblage...
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View PDF for article title, Complex Nb-ta-ti-sn Oxide Mineral Intergrowths in the La Calandria Pegmatite, CaÑada Del Puerto, CÓrdoba, Argentina
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Fluorcalciomicrolite structure.

Fluorcalciomicrolite structure.

Published: 01 October 2013
F ig . 4. Fluorcalciomicrolite structure.
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Raman spectrum of fluorcalciomicrolite.

Raman spectrum of fluorcalciomicrolite.

Published: 01 October 2013
F ig . 2. Raman spectrum of fluorcalciomicrolite.
Journal Article

Fluor-elbaite, lepidolite and Ta–Nb oxides from a pegmatite of the 3000 Ma Sinceni Pluton, Swaziland: evidence for lithium–cesium–tantalum (LCT) pegmatites in the Mesoarchean

Edward S. Grew, Ferdinando Bosi, Linus Ros, Per Kristiansson, Mickey E. Gunter, Ulf Hålenius, Robert B. Trumbull, Martin G. Yates
Published: 01 March 2018
European Journal of Mineralogy (2018) 30 (2): 205–218.
DOI: https://doi.org/10.1127/ejm/2017/0029-2686
... in lepidolite, as grains up to 11 µm long, including fluorcalciomicrolite, columbite-(Mn) with Nb > Ta, hübnerite(?) and a possible Pb-bearing microlite (Ta > Nb). The oxides, together with the muscovite, are interpreted to be related to later hydrothermal reworking of the primary lepidolite–fluor-elbaite...
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View PDF for article title, Fluor-elbaite, lepidolite and Ta–Nb oxides from a pegmatite of the 3000 Ma Sinceni Pluton, Swaziland: evidence for lithium–cesium–tantalum (LCT) pegmatites in the Mesoarchean
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Journal Article

THE CRYSTAL STRUCTURE OF A MICROLITE-GROUP MINERAL WITH A FORMULA NEAR NaCaTa 2 O 6 F FROM THE MORRO REDONDO MINE, CORONEL MURTA, MINAS GERAIS, BRAZIL

Marcelo B. Andrade, Daniel Atencio, Luiz A.D. Menezes Filho, Javier Ellena
Published: 01 April 2011
The Canadian Mineralogist (2011) 49 (2): 615–621.
DOI: https://doi.org/10.3749/canmin.49.2.615
... and “fluorcalciomicrolite”. The crystal structure, Fd 3̅ m , a = 10.4396(12) Å, has been refined to an R 1 value of 0.0258 ( wR 2 = 0.0715) for 107 reflections (Mo K α radiation). There is a scarcity of crystal-chemical data for pyrochlore-supergroup minerals in the literature. A compilation of these data is presented...
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View PDF for article title, THE CRYSTAL STRUCTURE OF A MICROLITE-GROUP MINERAL WITH A FORMULA NEAR NaCaTa 2 O 6 F FROM THE MORRO REDONDO MINE, CORONEL MURTA, MINAS GERAIS, BRAZIL
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Journal Article

THE PYROCHLORE SUPERGROUP OF MINERALS: NOMENCLATURE

Daniel Atencio, Marcelo B. Andrade, Andrew G. Christy, Reto Gieré, Pavel M. Kartashov
Published: 01 June 2010
The Canadian Mineralogist (2010) 48 (3): 673–698.
DOI: https://doi.org/10.3749/canmin.48.3.673
... pour être considérées valides: hydroxycalciopyrochlore, fluornatropyrochlore, fluorcalciopyrochlore, fluorstrontiopyrochlore, fluorkénopyrochlore, oxynatropyrochlore, oxyplumbopyrochlore, oxyyttropyrochlore-(Y), kénoplumbopyrochlore, fluorcalciomicrolite, oxycalciomicrolite, kénoplumbomicrolite...
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View PDF for article title, THE PYROCHLORE SUPERGROUP OF MINERALS: NOMENCLATURE
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SELECTED COMPOSITIONS OF FLUORCALCIOMICROLITE FROM THE LA CALADRIA PEGMATIT...

Published: 01 July 2016
TABLE 3. SELECTED COMPOSITIONS OF FLUORCALCIOMICROLITE FROM THE LA CALADRIA PEGMATITE
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Fourier transform infrared spectroscopy (FTIR) of fluorcalciomicrolite.

Fourier transform infrared spectroscopy (FTIR) of fluorcalciomicrolite.

Published: 01 October 2013
F ig . 3. Fourier transform infrared spectroscopy (FTIR) of fluorcalciomicrolite.
Image
Fluorcalciomicrolite from Nazareno, Minas Gerais, Brazil (RRUFF project id: R120127).

Fluorcalciomicrolite from Nazareno, Minas Gerais, Brazil (RRUFF project id:...

Published: 01 October 2013
F ig . 1. Fluorcalciomicrolite from Nazareno, Minas Gerais, Brazil (RRUFF project id: R120127).
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(a) Raman spectra of hydroxycalciomicrolite (R130269), along with that of fluorcalciomicrolite (R120127) for comparison. (b) Detailed view of the OH region.

( a ) Raman spectra of hydroxycalciomicrolite (R130269), along with that of...

Published: 01 June 2017
Fig. 4. ( a ) Raman spectra of hydroxycalciomicrolite (R130269), along with that of fluorcalciomicrolite (R120127) for comparison. ( b ) Detailed view of the OH region.
Journal Article

Importance of Ca-rich fluids for the formation of secondary Sc-minerals. An example from a metaluminous pegmatite Kožichovice II, Czech Republic

Jakub Výravský, Radek Škoda, Milan Novák
Published: 01 December 2024
Mineralogical Magazine (2024) 88 (6): 787–803.
DOI: https://doi.org/10.1180/mgm.2024.85
...Figure 2. BSE images of the mineral assemblages. (a) Euhedral zircon associated with columbite-(Mn) and fersmite, fluorcalciomicrolite, thortveitite and titanite. (b) and (c) Corroded relics of columbite replaced by fersmite and overgrown by euhedral crystals of nioboheftetjernite. (d) Complexly...
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Backscattered electron images, mineral abbreviations as in Figure 2. (a) Achalaite with intergrowths of Ta-rich rutile and widespread replacement by fluorcalciomicrolite close to the border with quartz (CP1-2). (b) Detail of the domains of achalaite and Ta-rich rutile, respectively, with a rim of ferrotitanowodginite at the interface (CP1-2). (c) Angular crystals of ferrotitanowodginite with small intergrowths of Ta-rich rutile, and Ta-rich rutile with intergrowths of ferrotitanowodginite or achalaite (CP1-2). (d) Tantalum-rich rutile showing some small fissures filled with grains of achalaite/ ferrotitanowodginite. A sector in the border zone is locally replaced by microlite; note the associated development of secondary Ta-rich rutile, which has a higher Ti# (CP1-3). (e) Achalaite hosting intergrowths of Ta-rich rutile is associated with Ta-rich rutile with intergrowths of achalaite/ferrotitanowodginite (CP2-1). (f) Achalaite with intergrowths of Ta-rich rutile profusely replaced by fluorcalciomicrolite (CP1-2B). (g) Primary Ta-rich rutile with intergrowths of ferrotitanowodginite (CP3-3). (h) Columbite-(Mn) (Col) transitionally replaced in its border by possible achalaite (Ach) (CP4-1).

Backscattered electron images, mineral abbreviations as in Figure 2 . (a) ...

Published: 01 July 2016
Fig. 3. Backscattered electron images, mineral abbreviations as in Figure 2 . (a) Achalaite with intergrowths of Ta-rich rutile and widespread replacement by fluorcalciomicrolite close to the border with quartz (CP1-2). (b) Detail of the domains of achalaite and Ta-rich rutile, respectively
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Representative compositions of oxides in wt.% and atoms per formula unit * ...

Published: 01 December 2024
Table 4. Representative compositions of oxides in wt.% and atoms per formula unit * Key: Nhef – nioboheftetjernite; Clb – columbite–(Mn); Fsm – fersmite; Pcl – fluorcalciopyrochlore; Mic – fluorcalciomicrolite (mean of 20 analyses). b.d. = below detection limit. * Nioboheftetjernite
Journal Article

Hydroxycalciomicrolite, Ca 1.5 Ta 2 O 6 (OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil

M. B. Andrade, H. Yang, D. Atencio, R. T. Downs, N. V. Chukanov, M. H. Lemée-Cailleau, A. I. C. Persiano, A. E. Goeta, J. Ellena
Published: 01 June 2017
Mineralogical Magazine (2017) 81 (3): 555–564.
DOI: https://doi.org/10.1180/minmag.2016.080.116
...Fig. 4. ( a ) Raman spectra of hydroxycalciomicrolite (R130269), along with that of fluorcalciomicrolite (R120127) for comparison. ( b ) Detailed view of the OH region. ...
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Journal Article

FLUORNATROMICROLITE, (Na,Ca,Bi) 2 Ta 2 O 6 F, A NEW MINERAL SPECIES FROM QUIXABA, PARAÍBA, BRAZIL

Thomas Witzke, Manfred Steins, Thomas Doering, Walter Schuckmann, Reinhard Wegner, Herbert Pöllmann
Published: 01 August 2011
The Canadian Mineralogist (2011) 49 (4): 1105–1110.
DOI: https://doi.org/10.3749/canmin.49.4.1105
...Fig. 2 Examples of fluornatromicrolite and “fluorcalciomicrolite” compositions according to the occupancy of the A-cation position. Symbols: ■ fluornatromicrolite, Quixaba, Brazil (this work), □ fluornatromicrolite, Altai Mountains, Russia ( Zalashkova & Kucharchik 1957...
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Backscattered electron images and chemical maps (b) of Nb-Ta oxide minerals from FA Li-pegmatites. (a) Columbite-group minerals (CGM) in association with albite and amblygonite-group minerals (AGM) in the Ramalha petalite-rich pegmatite (P016). Note relics of K-feldspar in albite. (b-d) Variably zoned CGM crystals from (b-c) the Bajoca petalite-rich pegmatite and (d) P010 Li-mica-rich pegmatite. Note rims or mantles with light BSE signals reflecting high Ta/Nb ratios. (e) Fluorcalciomicrolite from the Ramalha-West (P017) Li-mica-rich pegmatite.

Backscattered electron images and chemical maps (b) of Nb-Ta oxide minerals...

Published: 10 January 2024
) Variably zoned CGM crystals from (b-c) the Bajoca petalite-rich pegmatite and (d) P010 Li-mica-rich pegmatite. Note rims or mantles with light BSE signals reflecting high Ta/Nb ratios. (e) Fluorcalciomicrolite from the Ramalha-West (P017) Li-mica-rich pegmatite.
Journal Article

THE PYROCHLORE SUPERGROUP: REMARKS ON NOMENCLATURE — RESPONSE

Daniel Atencio
Published: 01 October 2013
The Canadian Mineralogist (2013) 51 (5): 803–804.
DOI: https://doi.org/10.3749/canmin.51.5.803
...: fluornatromicrolite ( Witzke et al. 2011 ), hydroxycalciopyrochlore ( Yang et al. 2011 ), hydroxymanganopyrochlore ( Chukanov et al. 2013 ), fluorcalciomicrolite ( Andrade et al. 2013a ), hydrokenomicrolite ( Andrade et al. 2013b ), fluorcalcioroméite ( Atencio et al. 2013 ), oxyplumboroméite ( Hålenius...
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