This paper reports the first structure refinement of natural wangdaodeite, LiNbO₃-type FeTiO₃ from the Ries impact structure. Wangdaodeite occurs together with recrystallized ilmenite clasts in shock melt veins which have experienced peak shock pressures of between 17 and 22 GPa. Comparison of natural and synthetic wangdaodeite points toward a correlation between the distortion of ferrate- and titanate-polyhedra and the c/a ratio of the unit cell. The Raman spectrum of wangdaodeite is calculated based on the refined structure. Comparison to the reported spectrum of the type-material shows that the Raman peak at 738–740 cm⁻¹ is indicative for this phase, whereas other features in type-wangdaodeite are tentatively assigned to disordered ilmenite.

中文翻译：

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天然旺达德石LiNbO3-型FeTiO3的结构分析

本文报道了从Ries冲击结构中对天然王道德石LiNbO ₃型FeTiO _3进行的首次结构细化。旺大德石与重结晶的钛铁矿碎屑一起出现在冲击熔体脉中，其经历了17至22 GPa的峰值冲击压力。天然和合成旺多德石的比较表明，高铁酸盐和钛酸盐多面体的变形与晶胞的c / a比之间存在相关性。基于精制结构计算出王大德石的拉曼光谱。与报告的典型材料光谱的比较表明，在738–740 cm ^-1处的拉曼峰是该相的指示，而旺多德石类型的其他特征暂定归因于无序钛铁矿。