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Hwang, S.-L., Shen, P., Chu, H.-T., Yui, T.-F., Varela, M.-E., Iizuka, Y. (2016) Kuratite, Ca4(Fe2+10Ti2)O4[Si8Al4O36], the Fe2+-analogue of rhönite, a new mineral from the D'Orbigny angrite meteorite. Mineralogical Magazine, 80 (6) 1067-1076 doi:10.1180/minmag.2016.080.043

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Reference TypeJournal (article/letter/editorial)
TitleKuratite, Ca4(Fe2+10Ti2)O4[Si8Al4O36], the Fe2+-analogue of rhönite, a new mineral from the D'Orbigny angrite meteorite
JournalMineralogical Magazine
AuthorsHwang, S.-L.Author
Shen, P.Author
Chu, H.-T.Author
Yui, T.-F.Author
Varela, M.-E.Author
Iizuka, Y.Author
Year2016 (October)Volume80
Page(s)1067-1076Issue6
PublisherMineralogical Society
DOIdoi:10.1180/minmag.2016.080.043Search in ResearchGate
Mindat Ref. ID244830Long-form Identifiermindat:1:5:244830:9
GUID42a0c821-2bf3-459f-b8ab-08adb66e5db8
Full ReferenceHwang, S.-L., Shen, P., Chu, H.-T., Yui, T.-F., Varela, M.-E., Iizuka, Y. (2016) Kuratite, Ca4(Fe2+10Ti2)O4[Si8Al4O36], the Fe2+-analogue of rhönite, a new mineral from the D'Orbigny angrite meteorite. Mineralogical Magazine, 80 (6) 1067-1076 doi:10.1180/minmag.2016.080.043
Plain TextHwang, S.-L., Shen, P., Chu, H.-T., Yui, T.-F., Varela, M.-E., Iizuka, Y. (2016) Kuratite, Ca4(Fe2+10Ti2)O4[Si8Al4O36], the Fe2+-analogue of rhönite, a new mineral from the D'Orbigny angrite meteorite. Mineralogical Magazine, 80 (6) 1067-1076 doi:10.1180/minmag.2016.080.043
Abstract/NotesAbstractKuratite, ideally Ca4(Fe2+10Ti2)O4[Si8Al4O36], the Fe2+-analogue of rhönite and a new member of the sapphirine supergroup, was identified from the D'Orbigny angrite meteorite by electron microscopy and micro-Raman spectroscopy. Based on the least-squares refinement of 25 d-spacings measured from selected-area electron diffraction patterns of 11 zone axes, the symmetry of kuratite was shown to be triclinic (space group by analogy to rhönite) with a = 10.513(7), b = 10.887(7), c = 9.004(18) Å, α = 105.97(13), β = 96.00(12), γ = 124.82(04)°, V = 767 ± 2 Å3 and Z = 1 for the 40 oxygen formula. The empirical formula based on eight electron microprobe analyses is (Ca3.88Na0.02REE3+0.03Mn0.03Mg0.01Ni0.02Zn0.01Sr0.01)∑4.01 (Fe2+9.989.9Ti2.00)∑11.98(Si7.80Al3.52Fe3+0.64P0.05S0.02)∑12.03O39.98F0.01Cl0.01. The simplified formula is Ca4(Fe2+10Ti2)O4[Si8Al4O36]. Micro-Raman spectroscopy showed four main bands resembling those of lunar rhönite but with higher frequencies due to different chemical composition. Analogous to the occurrence of kuratite in terrestrial basaltic rocks, kuratite coexisting with Al, Ti-bearing hedenbergite, ulvöspinel, iron-sulfide, tsangpoite, Ca-rich fayalite and kirschsteinite in D'Orbigny angrite most probably was formed at >1000°C by rapid cooling of an interstitial melt, which is subsilicic, almost Mg-free but enriched in Al-P-Ca-Ti-Fe.


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