【摘要】 兴安石是我国新发现的一种富含稀土、铍的硅酸盐新矿物,其理想的化学式为（Y,Ce）BeSiO₄（OH）。该矿物属于单斜晶系,利用四圆单晶衍射仪收集强度数据,测得α=4.7681±0.00263,b=7.6757±0.00686,c=9.9301±0.00639;α=90°,β=90.17°±0.053°,γ=90°;空间群为P2₁/c;Z=4。利用直接法及电子密度函数法测定了晶体结构,经最小二乘修正,最后的偏离因子R=0.086。 结构测定结果证实兴安石具有硅硼钙石的结构类型,与羟磷铍钙石,硅铍钇矿等均属同构似型矿物。更多还原

【Abstract】 Xinganite, a new mineral discovered in China, is a REE-Be-rich silicate. The ideal formula is: （Y, Ce） BeSiO₄（OH）. The mineral is monoclinic. The intensity data were collected with a single-crystal four-circle diffractometer. The cell parameters are: a=4.7681（±0.00263）, b=7.6757（±0.00686）, c=9.9301（±0.00639）, α=90°,β=90.17°（±0.0053°）,γ=90°, Space group P2₁/c. Z=4. The crystal structure has been determined by direct methods and electron-density synthesis methods. The least squares refinement gave a final discrepancy index R=0.086.The crystal structural analysis shows that xinganite is of datolite-type structure.更多还原