Tantalowodginite, (Mn0.5□0.5)TaTa2O8, a New Mineral Species from the Emmons Pegmatite, Uncle Tom Mountain, Maine, U.S.A.

Hanson, Sarah L.; Falster, Alexander U.; Simmons, William B.; Sprague, Raymond A.; Vignola, Pietro; Rotiroti, Nicola; Andó, Sergio; Hatert, Frédéric

doi:10.3749/canmin.1800009

Cited by 8 publications

(6 citation statements)

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“…According to the current classification of the International Mineralogical Association (IMA) [16], the following minerals of the wodginite group are distinguished: wodginite (MnSnTa2O8) [14]; titanowodginite (MnTiTa2O8) [5]; ferrowodginite (FeSnTa2O8) [5]; ferrotitanowodginite (FeTiTa2O8) [57]; lithiowodginite (LiTaTa2O8) [59]; tantalowodginite ((Mn0.5□0.5)TaTa2O8) [35]; and "wolframowodginite" (unapproved mineral species) (MnTi(Ta,W)2O8) [46] (Table 1, 2). Varieties of WGM differ in the ratio of major and minor elements (> 0.01%): W, Fe 3+ , Ca, Sc, Zr, Hf.…”

Section: Classification Structure and Properties Of Minerals Of The W...mentioning

confidence: 99%

“…Intrusive and exocontact bodies of pegmatites at deposits such as Wodgina (Australia), Bernic Lake (Canada), Koktogai (China), Bikita (Zimbabwe), Varuträsk (Sweden), Vishnyakovskoe (Russia) and others are located on crystalline shields, in Caledonian and Hercynian folded structures and have Precambrian or Paleozoic age [1,4,7]. Mesozoic and Cenozoic pegmatites containing wodginite are also found [34,35].…”

Section: Minerals Of the Wodginite Groupindicators Of Tantalum-bearin...mentioning

confidence: 99%

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Wodginite as an indicator mineral of tantalum-bearing pegmatites and granites

Alekseev

2023

PMI

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In the composition of tantalum-niobates the tin-bearing wodginite group minerals (WGM) were found: wod-ginite, titanowodginite, ferrowodginite, ferrotitanowodginite, lithiowodginite, tantalowodginite, “wolframowodginite”. We reviewed the worldwide research on WGM and created a database of 698 analyses from 55 sources including the author's data. WGM are associated with Li-F pegmatites and Li-F granites. Wodginite is the most prevalent mineral, occurring in 86.6 % of pegmatites and 78.3 % of granites. The occurrence of WGM in granites and pegmatites differs. For instance, titanowodginite and “wolframowodginite” occur three times more frequently in granites than in pegmatites, whereas lithiowodginite and tantalowodginite do not appear in granites at all. The difference between WGM in granites and pegmatites is in finer grain size, higher content of Sn, Nb, Ti, W, and Sc; lower content of Fe3+, Ta, Zr, Hf; higher ratio of Mn/(Mn + Fe); and lower ratio of Zr/Hf. The evolutionary series of WGM in pegmatites are as follows: ferrowodginite → ferrotitanowodginite → titanowodginite → “wolframowodginite” → wodginite → tantalowodginite; in granites: ferrowodginite → ferrotitanowodginite → “wolframowodginite” → wodginite → titanowodginite. WGM can serve as indicators of tantalum-bearing pegmatites and granites. In Russia the promising sources of tantalum are deposits of the Far Eastern belt of Li-F granites containing wodginite.

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Section: Classification Structure and Properties Of Minerals Of The W...mentioning

confidence: 99%

Section: Minerals Of the Wodginite Groupindicators Of Tantalum-bearin...mentioning

confidence: 99%

Wodginite as an indicator mineral of tantalum-bearing pegmatites and granites

Alekseev

2023

PMI

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“…Ferrotitanowodginite, FeTiTa 2 O 8 , has been described from the San Elías pegmatite, Sierra de la Estanzuela, San Luis Province, Argentina (Galliski et al, 1999). Tantalowodginite, (Mn 0.5 □ 0.5 )TaTa 2 O 8 , was found in the Emmons granite pegmatite dyke in Oxford County, Maine, USA (Hanson et al, 2018).…”

Section: Wodginite Groupmentioning

confidence: 99%

“…Tantalowodginite , (Mn 0.5 □ 0.5 )TaTa 2 O 8 , was found in the Emmons granite pegmatite dyke in Oxford County, Maine, USA (Hanson et al , 2018).…”

Section: Minerals Belonging To the Columbite Supergroupmentioning

confidence: 99%

Columbite supergroup of minerals: nomenclature and classification

Чуканов

Pasero

Aksenov

et al. 2022

MinMag

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The columbite supergroup is established. It includes five mineral groups (ixiolite, wolframite, samarskite, columbite, and wodginite) and one ungrouped species (lithiotantite). The criteria for a mineral to belong to the columbite supergroup are: the general stoichiometry MO2; the crystal structure based on the hexagonal close packing (hcp) of anions (or close to it); the six-fold coordination number of M-type cations (augmented to eight-fold in the case of slight distortion of hcp); and the presence of zig-zag chains of edge-sharing M-centered polyhedra. The ixiolite-type structure is considered as an aristotype with the space group Pbcn, the smallest unit cell volume, and the basic vectors a0, b0, c0. Based on the multiplying of the ixiolite-type unit cell the following derivatives are distinguished: ixiolite type (ixiolite-group minerals; a = a0, b = b0, c = c0; Pbcn; the members are ixiolite-(Mn 2+ ), ixiolite-(Fe 2+ ), scrutinyite, seifertite, and srilankite), wolframite type (wolframite-group minerals, ordered analogs of the ixiolite type with a = a0, b = b0, c = c0; P2/c; the members are ferberite, hübnerite, huanzalaite, sanmartinite, heftetjernite, nioboheftetjernite, rossovskyite, and andriesite), samarskite type (samarskite-group minerals; a = 2a0, b = b0, c = c0; P2/c; the members are samarskite-(Y), ekebergite, and shakhdaraite-(Y)), columbite type (columbite-group minerals; a = 3a0, b = b0, c = c0; Pbcn; the members are columbite-(Fe), columbite-(Mn), columbite-(Mg), tantalite-(Fe), tantalite-(Mn), tantalite-(Mg), fersmite, euxenite-(Y), tanteuxenite-(Y), and uranopolycrase), and wodginite type (wodginite-group minerals; a = 2a0, b = 2b0, c = c0; C2/c; the members are wodginite, ferrowodginite, titanowodginite, ferrotitanowodginite, tantalowodginite, lithiowodginite, and achalaite). Samarskite-(Yb), ishikawaite, and calciosamarskite are insufficiently studied minerals tentatively considered as possible members of the samarskite supergroup. Qitianlingite, yttrocolumbite-(Y), yttrotantalite-(Y), and yttrocrasite-(Y) are questionable minerals which need further studies. Polycrase-(Y) is discredited as a mineral identical with euxenite-(Y). Ixiolite has been renamed to ixiolite-(Mn 2+ ),with the end-member formula (Ta2/3Mn 2+ 1/3)O2. Ta-and Nb-dominant analogues of ixiolite with different schemes of charge balancing have the end-member formulae (M1 5+ 0.5M2 3+ 0.5)O2,

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“…In these cavities a wealth of microminerals (1 mm or less) can be found. Examples include quartz, muscovite, cassiterite, fluorapatite, bertrandite, perhamite, zircon, columbite-tantalite, hydroxylherderite, tantalowodginite (Hanson et al, 2018), and many others. In the core margin and core zone, replacement of primary phosphates by secondary phosphates is widespread.…”

Section: Sample Description and Mineralogymentioning

confidence: 99%

Crystal structure of correianevesite from the Emmons pegmatite, Uncle Tom Mountain, Greenwood, Oxford County, Maine

Vignola¹,

Demartin²,

Campostrini³

et al. 2021

Bull. Soc. Roy. Sc. de Liège

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Correianevesite, Fe2+Mn2+2(PO4)2·3H2O, is an uncommon secondary phosphate in granitic pegmatites. Described for the first time from the Cigana pegmatite (Conselheiro Pena, Brazil), it was subsequently reported only at the Berry-Havey pegmatite (Androscoggin County, Maine, U.S.A.). A single crystal from a new occurrence at the Emmons pegmatite, Oxford Co., Maine, gave the following unit cell unit cell parameters: a = 9.4872(19), b = 10.121(2), c = 8.7023(17) (Å), V 835.6(3) (Å3). The structure was anisotropically refined in the orthorhombic system, space group Pbna down to a R = 1.6% and the hydrogen-bond pattern could be determined. Microprobe chemical analysis, and bond valence calculation show the expected values for all the atomic sites and confirmed the valence of all ions in the structure.

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Tantalowodginite, (Mn0.5□0.5)TaTa2O8, a New Mineral Species from the Emmons Pegmatite, Uncle Tom Mountain, Maine, U.S.A.

Cited by 8 publications

References 9 publications

Wodginite as an indicator mineral of tantalum-bearing pegmatites and granites

Wodginite as an indicator mineral of tantalum-bearing pegmatites and granites

Columbite supergroup of minerals: nomenclature and classification

Crystal structure of correianevesite from the Emmons pegmatite, Uncle Tom Mountain, Greenwood, Oxford County, Maine

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