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Kuratite, Ca4(Fe2+10Ti2)O4[Si8Al4O36], the Fe2+-analogue of rhönite, a new mineral from the D'Orbigny angrite meteorite

Published online by Cambridge University Press:  02 January 2018

S.-L. Hwang ,
P. Shen ,
H.-T. Chu ,
T.-F. Yui ,
M.-E. Varela  and
Y. Iizuka
S.-L. Hwang*
Affiliation:
Department of Materials Science and Engineering, National Dong Hwa University, Hualien, Taiwan, ROC
P. Shen
Affiliation:
Department of Materials Science and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
H.-T. Chu
Affiliation:
Central Geological Survey, PO Box 968, Taipei, Taiwan, ROC
T.-F. Yui
Affiliation:
Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC
M.-E. Varela
Affiliation:
Instituto de Ciencias Astronómicas de la Tierra y del Espacio (ICATE)Avenida España 1512 sur, J5402DSP, San Juan,Argentina
Y. Iizuka
Affiliation:
Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC
*
*E-mail: slhwang@mail.ndhu.edu.tw
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Abstract

Kuratite, 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.

Keywords

kuratitenew mineralangriteD’Orbignyrhönitesapphirine supergroup
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 6 , October 2016 , pp. 1067 - 1076
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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