Reguir, E. P., Chakhmouradian, A. R., Mitchell, R. H. (2003) Pb-bearing hollandite-type titanates: A first natural occurrence and reconnaissance synthesis study. Mineralogical Magazine, 67 (5) 957-965 doi:10.1180/0026461036750153
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Pb-bearing hollandite-type titanates: A first natural occurrence and reconnaissance synthesis study | ||
| Journal | Mineralogical Magazine | ||
| Authors | Reguir, E. P. | Author | |
| Chakhmouradian, A. R. | Author | ||
| Mitchell, R. H. | Author | ||
| Year | 2003 (October) | Volume | 67 |
| Issue | 5 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/0026461036750153Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243491 | Long-form Identifier | mindat:1:5:243491:3 |
| GUID | 0 | ||
| Full Reference | Reguir, E. P., Chakhmouradian, A. R., Mitchell, R. H. (2003) Pb-bearing hollandite-type titanates: A first natural occurrence and reconnaissance synthesis study. Mineralogical Magazine, 67 (5) 957-965 doi:10.1180/0026461036750153 | ||
| Plain Text | Reguir, E. P., Chakhmouradian, A. R., Mitchell, R. H. (2003) Pb-bearing hollandite-type titanates: A first natural occurrence and reconnaissance synthesis study. Mineralogical Magazine, 67 (5) 957-965 doi:10.1180/0026461036750153 | ||
| Abstract/Notes | AbstractSome samples of hollandite-type titanates from the Murun alkaline complex (Yakutia, Russia) contain appreciable amounts of Pb (up to 12.5 wt.% PbO). These titanates occur in a pegmatitic K-feldsparaegirine rock containing subordinate K-rich batisite, titanite, wadeite and other minerals. The Pb-bearing crystals coexist with hollandite-type phases devoid of detectable Pb and zoned from a Kdominant (priderite) core to a Ba-dominant (henrymeyerite) rim. Recalculation of the microprobe analyses on the stoichiometric basis indicates that most of the Fe occurs in this mineral in trivalent form, suggesting the existence of a solid solution between the Ba(Ti6Fe)O16, K2(Ti6Fe)O16 and Pb(Ti6Fe)O16 end-members. The maximum proportion of the latter end-member in the Murun titanates is ∽45 mol.%. The Ba-free compositions [Pb1.0–1.3(Ti,Fe)8O16] and intermediate members of the (Ba1–xPbx)(Ti6Fe)O16 series were synthesized at 1050 –1100ºC. The synthesis products comprise tetragonal hollandites of various stoichiometry intermixed with rutile, a pseudobrookite-type phase and (for the Ba-free compositions) minor macedonite. Electron microprobe analyses of the hollandites indicate that there is a continuous series of compositions between the two hexatitanate end-members, Ba(Ti6Fe)O16 and Pb(Ti6Fe)O16. The crystal structure of one intermediate member was refined by the Rietveld method in space group I4/m, and found to differ from the hollandite archetype (i.e. Pb-bearing Ba manganate) in that Pb is preferentially partitioned into the 2b tunnel site at (0,0,½), whereas Ba is partitioned into the larger 4e site at (0,0,∽0.8). | ||
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