【摘要】 在东喜马拉雅构造结火成碳酸岩脉中发现富碳硼镁钛石。晶体结构与化学成分分析表明 ,该矿物的分子式为 ( Mg1.30 ,Ti0 .32 ,Fe0 .30 ,Al0 .10 ) 2 .0 2 [( B0 .51,C0 .4 2 ) 0 .93O3]O。这提供了在 [BO3]原子团中 B可被其它元素替换的第一个实例 ,暗示该矿物可能形成于高温高压的环境下。更多还原

【Abstract】 The C rich warwickite was discovered in a carbonatite vein from the eastern Himalayan syntaxis. Crystal and compositional analyses show that the formula of this mineral can be described as (Mg 1.30 , Ti 0.32 , Fe 0.30 , Al 0.10 ) 2.02 [(B 0.51 , C 0.42 ) 0.93 O 3]O. This provides the first example that B can be substituted by other elements in [BO 3] group, implying that the C rich warwickite was formed under high pressure and temperature.更多还原