... 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, Ca 9.00 Na 0.98 (Mg 0.95 Fe 0.06 ) ∑1.01 (P 1.00 O 4 ) 7 , from the Suizhou meteorite, a shock-metamorphosed L6...

...Table 1. Compositions of minerals in the Suizhou meteorite (wt %) ...

...Fig. 1 Top : General view (SEM-BSE image) of the portion of Suizhou meteorite where shenzhuangite (shz) was found. Bottom : Blow-up of the red area in the top panel (SEM-BSE image). The taenite (tae) grain shows variation of the Ni/Fe ratio with Ni enrichments along the boundaries. “Ol...

... related to CaFe 2 O 4 -type. The high-pressure phase relations in FeCr 2 O 4 reveal that natural FeCr 2 O 4 -rich phases of CaFe 2 O 4 - and CaTi 2 O 4 -type structures found in the shocked Suizhou meteorite were formed above about 18 GPa at temperature below and above 1300 °C, respectively. The phase...

...Fig. 3. Raman spectra of tuite in the Suizhou meteorite. ...

...Figure 1. Top: SEM-BSE image of asimowite (inmelt droplets inside the bright Fe,Ni-metal) in the Suizhou meteorite. Bottom: Enlarged region highlighted in the top image with a dashed red rectangle. ASW = asimowite, FAY = fayalite. The brightness variation in the Fe,Ni-metal are due to different...

... through solid-state transformation or crystallization from the dense silicate melt. Tuite, with the structure of trigonal γ-Ca 3 (PO 4 ) 2 , was first identified in the SMVs of the Suizhou L6 chondrite ( Xie et al. 2002 ) as a high-pressure polymorph of merrillite and later in other meteorites...

.... , and Fei , Y. ( 2002 ) Natural high-pressure polymorph of merrillite in the shock vein of the Suizhou meteorite . Geochimica et Cosmochimica Acta , 66 , 2439 – 2444 . Xie , X. , Minitti , M.E. , Chen , M. , Mao , H.-K. , Wang , D. , Shu , J. , and Fei , Y. ( 2003...

... contributions is the discovery of natural FeCr 2 O 4 with a CF structure and xieite (the natural CaTi 2 O 4 -type polymorph of chromite) in the Suizhou meteorite, a highly shocked L6 chondrite ( Chen et al. 2003a , 2003b ; 2008 ). The Tissint meteorite, which fell at Tata, Morocco on 18 July 2011...

... was proposed to form from the decomposition of apatite or solid-state phase transformation of merrillite ( Murayama et al. 1986 ; Xie et al. 2002a , 2013 , 2016 ). Some tuite grains in Suizhou ( Xie et al. 2016 ) and NWA 7755 ( Wang et al. 2017 ) meteorites were found coexisting with Cl-rich apatite...

... of the Suizhou meteorite, Chen et al. (2003a , 2003b ) reported that chromite spinel transforms to the CF-type structure at 12.5 GPa and to the CT-type structure above 20 GPa. Due to their importance in the geosciences, physics, materials science, and crystallography, properties of chromite spinels have...