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Chemical composition and crystal structure of merrillite from the Suizhou meteorite
-
Xiande Xie
,
Xiangping Gu
Veröffentlicht/Copyright:
24. November 2015
Abstract
Merrillite, ideally Ca9NaMg(PO4)7, is an important accessory phosphate mineral in many different groups of meteorites, including martian meteorites, and a major carrier of rare earth elements (REE) in lunar rocks. By means of electron microprobe analysis, single-crystal X‑ray diffraction, and Raman spectroscopy, we present the first structure determination of merrillite with a nearly ideal chemical composition, Ca9.00Na0.98(Mg0.95Fe0.06)Σ1.01 (P1.00O4)7, from the Suizhou meteorite, a shock-metamorphosed L6-chondrite. Suizhou merrillite is trigonal with space group R3c and unit-cell parameters a = 10.3444(3), c = 37.0182(11) Å, and V = 3430.5(2) Å3. Its crystal structure, refined to R1 = 0.032, is characterized by a structural unit consisting of a [(Mg,Fe)(PO4)6]16- complex anion that forms a “bracelet-and-pinwheel” arrangement. Such structural units are linked by interstitial complexes with a formula of [Ca9Na(PO4)]16+, which differs from that of [Ca9(PO3[OH])]16+, [Ca9(PO3F)]16+, [Ca9(Ca0.5□0.5)(PO4)]16+, or [(Ca9-xREE)x(Na1-x□x) (PO4)]16+ in terrestrial whitlockite, terrestrial/extraterrestrial bobdownsite, meteoritic Ca-rich merrillite, or lunar REE-rich merrillite, respectively. The Suizhou merrillite is found to transform to tuite at high pressures, pointing to the likelihood of finding REE-bearing tuite on the Moon as a result of shock events on REE-merrillite.
Received: 2015-7-8
Accepted: 2015-8-10
Published Online: 2015-11-24
Published in Print: 2015-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Merrillite;
whitlockite;
Suizhou meteorite;
crystal structure;
Raman spectroscopy
Artikel in diesem Heft
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- Stable and metastable silicate liquid immiscibility in ferrobasalts
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- Trace element partitioning into sulfide: How lithophile elements become chalcophile and vice versa
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- The accretion and differentiation of Earth under oxidizing conditions
- Dislocation microstructures in simple-shear-deformed wadsleyite at transition-zone conditions: Weak-beam dark-field TEM characterization of dislocations on the (010) plane
- Chemical composition and crystal structure of merrillite from the Suizhou meteorite
