Hidden story of tapiolite

Ercit, T. Scott

doi:10.1180/minmag.2010.074.4.715

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…There is an empirically derived miscibility gap between tantalite-(Fe) and tapiolite-(Fe) (Černý et al 1992). A solid solution exists between tapiolite-(Fe) and tapiolite-(Mn); however, Mn has limited substitution for Fe, typically less than 2.0% MnO (Wise & Černý 1996;Ercit 2010). …”

Section: Columbite-tantalite Solid Solution Seriesmentioning

confidence: 99%

Pyrochlore and columbite-tantalite as indicator minerals for specialty metal deposits

Mackay

Simandl

2015

GEEA

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Pyrochlore supergroup and columbite-tantalite series minerals can be used as indicators for specialty metal deposits. Their mineral chemistry can be used to target specific specialty metal deposit-types and provide a vector towards mineralisation. A ternary Nb-Ti-Ta discrimination diagram for the pyrochlore supergroup shows that minerals from carbonatites and related deposits occupy the pyrochlore field and extend slightly into the betafite and microlite fields (>35% Nb, <65% Ti, and <45% Ta). Those from peralkaline complexes define a narrow zone paralleling the Nb-Ti join (>40% Nb, <60% Ti, and <10% Ta). Pyrochlore supergroup minerals from Li-Cs-Ta enriched (LCT) pegmatites occupy the microlite field (<90% Nb, ≤40% Ti, and > 15% Ta) whereas those from peraluminous granites plot in the microlite field along the Nb-Ta join, extending slightly into the pyrochlore field (<65% Nb, <10% Ti, and >35% Ta) on the Nb-Ti-Ta ternary diagram. The discrimination diagram for pyrochlore supergroup minerals is based on 349 new electron microprobe analyses from British Columbia and Québec, Canada, combined with 879 published analyses from 50 deposits worldwide. A columbite-tantalite series discrimination quadrilateral indicates that minerals from carbonatites and related deposits are Nb-rich, with Mn/(Mn+Fe) and Ta/(Ta+Nb) atomic ratios ≤ 0.25 and ≤ 0.20, respectively. Columbite from peralkaline complexes plot along the FeNb 2 O 6 –MnNb 2 O 6 join of the quadrilateral and have Mn/(Mn+Fe) ratios of ≤ 0.65 and Ta/(Ta+Nb) ratios of ≤ 0.15. Fe-Nb-rich varieties within this zone slightly overlap with those from carbonatites. Columbite-tantalite series minerals from Li-Cs-Ta (LCT) pegmatites and peraluminous granites are not well constrained but do slightly overlap with columbite-(Fe) from carbonatites. A minor overlap exists between the fields from carbonatites, peralkaline complexes, LCT pegmatites, and peraluminous granites near the columbite-(Fe) corner of the quadrilateral. The discrimination diagram for columbite-tantalite series minerals is based on 153 new electron microprobe analyses from British Columbia combined with over 2500 analyses complied from the literature. Combining the two discrimination diagrams presented here enhances their effectiveness to explore for specialty metal deposits.

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Section: Columbite-tantalite Solid Solution Seriesmentioning

confidence: 99%

Pyrochlore and columbite-tantalite as indicator minerals for specialty metal deposits

Mackay

Simandl

2015

GEEA

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“…Table 4 is the result for FeTa 2 O 6 (mp-31755), an ordered tapiolite [71], a cation-ordered derivative of the rutile structure [72,73], of which antiferromagnetism was investigated [72,[74][75][76][77]. Its space group P 4 2 {mnm was found as the first scored one.…”

Section: Conceptmentioning

confidence: 99%

Graph-Text Contrastive Learning of Inorganic Crystal Structure toward a Foundation Model of Inorganic Materials

Ozawa,

Suzuki,

Tonogai

et al. 2024

Preprint

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Developing foundation models for materials science has attracted attention. However, there is a lack of work on inorganic materials due to the difficulty in the comprehensive representation of geometric concepts composing crystals, from the local atomic environments, their connections, and the global symmetries. We present a contrastive learning of inorganic crystal structure (CLICS) for embedding the geometric concepts, which contrasts texts representing the contextual patterns of geometries with the crystal graphs. We demonstrate that the geometric concepts are integrally embedded on CLICS feature space, through experiments of concept retrieval from crystal graphs, similar structure search, and few-shot/imbalanced crystal structure classification.

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“…Table 4 is the result for FeTa 2 O 6 (mp-31755), an ordered tapiolite [70], a cation-ordered derivative of the rutile structure [71,72], of which antiferromagnetism was investigated [71,[73][74][75][76]. Its space group P 4 2 {mnm was found as the first scored one.…”

Section: Retrieval Accuracies Of Space Group and Local Atomic Environ...mentioning

confidence: 99%

Graph-Text Contrastive Learning of Inorganic Crystal Structure toward a Foundation Model of Inorganic Materials

Ozawa,

Suzuki,

Tonogai

et al. 2024

Preprint

View full text Add to dashboard Cite

Developing foundation models for materials science has attracted attention. However, there is a lack of studies on inorganic materials due to the difficulty in the comprehensive representation of geometric concepts composing crystals: local atomic environments, their connections, and the global symmetries. We present a contrastive learning of inorganic crystal structure (CLICS) for embedding the geometric concepts, which contrasts texts representing the contextual patterns of geometries with the crystal graphs. We demonstrate that the geometric concepts are integrally embedded on the CLICS feature space, through experiments of concept retrieval from crystal graphs, similar structure search, and few-shot/imbalanced crystal structure classification.

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Hidden story of tapiolite

Cited by 8 publications

References 8 publications

Pyrochlore and columbite-tantalite as indicator minerals for specialty metal deposits

Pyrochlore and columbite-tantalite as indicator minerals for specialty metal deposits

Graph-Text Contrastive Learning of Inorganic Crystal Structure toward a Foundation Model of Inorganic Materials

Graph-Text Contrastive Learning of Inorganic Crystal Structure toward a Foundation Model of Inorganic Materials

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