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New minerals tsangpoite Ca5(PO4)2(SiO4) and matyhite Ca9(Ca0.5□0.5)Fe(PO4)7 from the D'Orbigny angrite

Published online by Cambridge University Press:  29 June 2018

Shyh-Lung Hwang ,
Pouyan Shen ,
Hao-Tsu Chu ,
Tzen-Fu Yui ,
Maria-Euginia Varela  and
Yoshiyuki Iizuka
Shyh-Lung Hwang*
Affiliation:
Department of Materials Science and Engineering, National Dong Hwa University, Hualien, Taiwan, ROC
Pouyan Shen
Affiliation:
Department of Materials Science and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC
Hao-Tsu Chu
Affiliation:
Central Geological Survey, PO Box 968, Taipei, Taiwan, ROC
Tzen-Fu Yui
Affiliation:
Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC
Maria-Euginia Varela
Affiliation:
Instituto de Ciencias Astronómicas de la Tierra y del Espacio (ICATE)Avenida España 1512 sur, J5402DSP, San Juan, Argentina
Yoshiyuki Iizuka
Affiliation:
Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC
*
*Author for correspondence: Shyh-Lung Hwang, Email: slhwang@gms.ndhu.edu.tw
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Abstract

Tsangpoite, ideally Ca5(PO4)2(SiO4), the hexagonal polymorph of silicocarnotite, and matyhite, ideally Ca9(Ca0.5□0.5)Fe(PO4)7, the Fe-analogue of Ca-merrillite, were identified from the D'Orbigny angrite meteorite by electron probe microanalysis, electron microscopy and micro-Raman spectroscopy. On the basis of electron diffraction, the symmetry of tsangpoite was shown to be hexagonal, P63/m or P63, with a = 9.489(4) Å, c = 6.991(6) Å, V = 545.1(6) Å3 and Z = 2 for 12 oxygen atoms per formula unit, and that of matyhite was shown to be trigonal, R3c, with a = 10.456 (7) Å, c = 37.408(34) Å, V = 3541.6 (4.8) Å3 and Z = 6 for 28 oxygen atoms per formula unit. On the basis of their constant association with the grain-boundary assemblage: Fe sulfide + ulvöspinel + Al–Ti-bearing hedenbergite + fayalite–kirschsteinite intergrowth, the formation of tsangpoite and matyhite, along with kuratite (the Fe-analogue of rhönite), can be readily rationalised as crystallisation from residue magmas at the final stage of the D'Orbigny meteorite formation. Alternatively, the close petrographic relations between tsangpoite/matyhite and the resorbed Fe sulfide rimmed by fayalite + kirschsteinite symplectite, such as the nucleation of tsangpoite in association with magnetite ± other phases within Fe sulfide and the common outward growth of needle-like tsangpoite or plate-like matyhite from the fayalite–kirschsteinite symplectic rim of Fe sulfide into hedenbergite, infer that these new minerals and the grain-boundary assemblage might represent metasomatic products resulting from reactions between an intruding metasomatic agent and the porous olivine–plagioclase plate + fayalite-kirschsteinite overgrowth + augite + Fe sulfide aggregates. Still further thermochemical and kinetics evidence is required to clarify the exact formation mechanisms/conditions of the euhedral tsangpoite, matyhite and kuratite at the grain boundary of the D'Orbigny angrite.

Keywords

angriteD'Orbignynew mineraltsangpoitematyhite
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 2 , April 2019 , pp. 293 - 313
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Sergey Krivovichev

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