Romeite group minerals (RGM) are oxides, which belong to the large pyrochlore supergroup of minerals. The general formula of the pyrochlore supergroup is A
2B
2X
6Y (A = Na, Ca, Ag, Mn, Sr, Ba, Fe(II), Pb, Sn(II), Sb(III), Bi(III), Y, REE, Sc, U, Th, □ and H
20, B = Ta, Nb, Ti, Sb(V), W, V(V), Sn(IV), Zr, Hf, Fe(III), Mg, Al, and Si, X = 0, 0H, or F and Y = (0H)–, F–, 02–, □, H
20, or even large cations, such as K, Rb, Cs). The crystal structure of RGM is build-up of B0
6 octahedral framework that forms tunnels along [110] where 8-coordinated A cations and Y anions are hosted. In the RGM, Sb(V) is the dominant cation at the B site, but on the A-site, larger cations can be incorporated where also the ion-exchange can take place. Therefore, RGM are often used for the immobilization of the toxic metals, such as Pb and Sr and have been frequently reported as weathering products in mining wastes and smelting residues resulting from Sb mining activities.
| Period | 24 Aug 2024 → 30 Aug 2024 |
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| Event title | EMC24: 17th European Microscopy Congress 2024 |
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| Event type | Conference |
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| Location | Copenhagen, DenmarkShow on map |
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| Degree of Recognition | International |
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