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manganotantalite

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Journal Article
Published: 01 April 2010
American Mineralogist (2010) 95 (4): 537–544.
... concentration, is not significant for pegmatites. The data also point out that the solubility of MnNb 2 O 6 and MnTa 2 O 6 is strongly temperature dependent, increasing by a factor of 50 for manganocolumbite and 15–20 for manganotantalite from 700 to 1000 °C under water-saturated conditions. The solubility also...
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Journal Article
Published: 01 December 2005
Mineralogical Magazine (2005) 69 (6): 917–935.
...J. R. Baldwin; P. G. Hill; A. A. Finch; O. von Knorring; G. J. H. Oliver Abstract We have analysed a rare occurrence of orange-brown manganotantalite lamellae (visible in hand specimen), intergrown with microlite [(Ca,Na) 2 (Ta,Nb) 2 (O,OH,F) 7 ], aggregates of ferrotapiolite, bismuth minerals...
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Journal Article
Published: 01 February 1929
American Mineralogist (1929) 14 (2): 75.
Journal Article
Published: 01 July 1919
American Mineralogist (1919) 4 (7): 80–83.
... as a manganotantalite. That it can still be obtained on the dumps at the locality was noted by Mr. Gordon 2 in 1918, and in the spring of the present year one of us (0. I. L.) found there a mass of bladed albite containing an unusually large crystal of the manganotantalite. It is about 7 mm. thick, and of irregular...
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Point analyses of <span class="search-highlight">manganotantalite</span> represented on the columbite quadrilater...
Published: 01 December 2005
F ig . 7. Point analyses of manganotantalite represented on the columbite quadrilateral and tie lines linking manganotantalite and tapiolite pairs. Manganotantalite groups: I = Primary manganotantalite-cross-cutting phase; II = lamellae; III = high-Ta group, replacement).
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REPRESENTATIVE EMP COMPOSITIONS OF Nb-RICH <span class="search-highlight">MANGANOTANTALITE</span> (ColTan), MANGA...
Published: 31 March 2018
TABLE 3. REPRESENTATIVE EMP COMPOSITIONS OF Nb-RICH MANGANOTANTALITE (ColTan), MANGANOTANTALITE DIRECTLY ASSOCIATED WITH MICROLITE (Tan), AND FERROTAPIOLITE (Tap) FROM MUNGWE
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An enlargement of an area of section XX showing the first phase of manganot...
Published: 01 December 2005
F ig . 8. An enlargement of an area of section XX showing the first phase of manganotantalite (Mn-Ta) (primary) at the base of section XX and the connection with the rectangular bean crystal (P – primary manganotantalite) seen in Fig. 4 . The area of Fig. 4 (inverted top to bottom) occupies
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BSE image photographs of columbite-tantalite. a) ferro- to manganocolumbite...
Published: 01 May 2003
Fig. 3. BSE image photographs of columbite-tantalite. a) ferro- to manganocolumbite from coarse-grained unit with fine oscillatory zoning, irregular bright areas - minerals of pyrochlore group; b) manganocolumbite to manganotantalite from graphic to blocky unit with simple oscillatory zoning; c
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BSE image of <span class="search-highlight">manganotantalite</span> lamellae in a matrix of microlite (m) and fer...
Published: 01 December 2005
F ig . 4. BSE image of manganotantalite lamellae in a matrix of microlite (m) and ferrotapiolite (Fe-Ta), manganotantalite (Mn-Ta) with cross-cutting veins of a Bi phase (Bi): Rubicon pegmatite, Karibib, Namibia. Data correspond to point analyses given in Table 3 . Scalebar: 500 μm.
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BSE image showing original exsolution lamellae of <span class="search-highlight">manganotantalite</span> (darker ...
Published: 01 December 2005
F ig . 5. BSE image showing original exsolution lamellae of manganotantalite (darker areas) and replacement of the original microlite by manganotantalite (lighter areas). Location of line of traverse which represents a 20% variation in Ta 2 O 5 wt.% is shown in Fig. 4 . Bi: bismuth phases.
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Image of section 1 (XX). <span class="search-highlight">Manganotantalite</span> lamellae occurring in a microlite...
Published: 01 December 2005
F ig . 1. Image of section 1 (XX). Manganotantalite lamellae occurring in a microlite matrix with bismuth (black), apatite (white) and a manganotantalite (tan) aggregate at bottom right. Wider red-brown cross-cutting areas are ferrotapiolite. Length of section is 1.7 cm. The arrow marks the line
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The effect of temperature on manganocolumbite and <span class="search-highlight">manganotantalite</span> solubili...
Published: 01 April 2010
F igure 3. The effect of temperature on manganocolumbite and manganotantalite solubility in water-saturated pegmatitic (PEG1 and PEG2) and granitic melts at 200 MPa. Data for granitic melts [LK97] from Linnen and Keppler (1997) .
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The effect of water content on manganocolumbite and <span class="search-highlight">manganotantalite</span> solubi...
Published: 01 April 2010
F igure 4. The effect of water content on manganocolumbite and manganotantalite solubility in pegmatitic (PEG1 and PEG2) and granitic melts at 1000 °C and 200 MPa. Data for granitic melts [LK97] from Linnen and Keppler (1997) . These experiments were conducted at 1035 °C.
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BSE image of <span class="search-highlight">manganotantalite</span> lamellae in a matrix of microlite (m) with cr...
Published: 01 December 2005
F ig . 3. BSE image of manganotantalite lamellae in a matrix of microlite (m) with cross-cutting veins of a bismuth phase (Bi): Rubicon pegmatite, Karibib, Namibia. The numbers correspond to data given in Table 2 ; T1, T2 and T3 correspond to point analyses along traverses across
Journal Article
Published: 01 June 2006
The Canadian Mineralogist (2006) 44 (3): 645–666.
... pegmatites of the Pampean pegmatite province in Argentina are evaluated. In general, the CGM range from ferrocolumbite to manganotantalite; the data plotted in the FeNb 2 O 5 –FeTa 2 O 5 –MnNb 2 O 5 –MnTa 2 O 5 quadrilateral show oblique, upward, bifurcated or ill-defined fractionation trends. In beryl-type...
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Journal Article
Published: 01 June 2002
The Canadian Mineralogist (2002) 40 (3): 799–814.
...), and ferrocolumbite occur in the primitive pockets in the central part (core zone), whereas U–Bi-rich polycrase-(Y), uranopolycrase, manganocolumbite, manganotantalite, “wolframo-ixiolite”, titanowodginite and microlite are found in the evolved pockets, at the extremities of the dike. Niobian rutile and euxenite-(Y...
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BSE images of micrograins of columbite-group minerals hosted by cassiterite...
Published: 01 October 2011
micrograin of manganocolumbite (1, 2) in cassiterite from saccharoidal albite unit. Note the partial resorption, overgrowth by manganotantalite (3, 4) and replacement of the subhedral crystal by oscillatory zoned secondary manganocolumbite (5) and manganotantalite (6). (d) Subhedral crystal
Journal Article
Published: 01 April 1998
The Canadian Mineralogist (1998) 36 (2): 609–635.
... belonging to the Mn-suite follow a similar pattern of crystallization, with early manganocolumbite followed by manganotantalite, the latter coexisting with wodginite. Manganocolumbite within individual samples varies appreciably in Mn/(Mn+Fe), whereas the variation in manganotantalite is mainly in Ta/(Ta+Nb...
Journal Article
Published: 01 January 2005
Exploration and Mining Geology (2005) 14 (1-4): 31–44.
.... Three Ta-oxide minerals (microlite, wodginite, manganotantalite) of primary origin predominate in the Ta-mineralized dikes, where they occur as fine, disseminated grains in the albite-rich pegmatite matrix. The sequence of crystallization is typically manganotantalite wodginite microlite, which conforms...
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Journal Article
Published: 01 August 2002
The Canadian Mineralogist (2002) 40 (4): 1047–1068.
..., and microlite in the middle facies. The composition of the columbite-group minerals corresponds to manganocolumbite and manganotantalite. Zircon contains mostly 4 to 8 wt% HfO 2 , but the HfO 2 contents may reach up to 22 wt% at the rim. From the lower part to the middle part of the drill hole, the progressive...
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