黄河矿—中华铈矿系列稀土矿物的多体性特征

Polysomatic Features of HuanghoiteZhonghuacerite Series Minerals

采用结晶学模块法研究了黄河矿（ＣｅＢａ（ＣＯ３）２Ｆ），中华铈矿（ＣｅＢａ２（ＣＯ３）３Ｆ）和氟碳铈钡矿（Ｃｅ２Ｂａ３（ＣＯ３）５Ｆ２）的晶体结构。三种矿物的晶体结构中存在五种相同的配位多面体及其单链。多面体链相互联接组成两种似层状模块（Ｈ）和（Ｚ）。黄河矿和中华铈矿的晶体结构分别由似层状模块（Ｈ）和（Ｚ）构筑而成，氟碳铈钡矿则由这两种模块的交替堆垛形成。根据多体模型三种矿物的结构可分别用（ＨＨ）、（Ｚ）和（ＨＺＨＺ）表示，（Ｚ）和（Ｈ）模块均具有１／２ｂ位移。借助多体模型可解释该系列矿物结构的堆垛无序和预测新多体矿物。

Modular approach was applied to the structural relationships in the series huanghoite(Ce), BaCe(CO_3)_2F, zhonghuacerite(Ce), Ba_2Ce(CO_3)_3F,and cebaite(Ce), Ba_3Ce_2(CO_3)_5F_2. The first two minerals can be considered to be built from layerlike modules(H) and (Z), respectively, and cebaite by an alternating stacking of these two modules. The three structures can thus be noted as (H), (Z) and (HZ), by which (H) and (Z) mean (H) and (Z) modules shifted by 1/2b. The observed structural disorder in the series is interpreted on this basis, and attention is drawn to further polysomes.