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用定向X射线衍射方法研究了产自新疆尉犁的两个水黑云母样品（Xj－1和Xj－2）。xj-1含有水黑云母和蛭石两种矿物，xj-2含有水黑云母和金云母两种矿物。两个样品中水黑云母的d001有所不同，它们的衍射峰形和行射强度与完全规则的水黑云母有一定的差异。根据图解法研究结果表明，在xj-1中观察到的水黑云母衍射数据实际上是大量水黑云母层与少量蛭石层不规则间层的结果，而在xj-2中观察到的水黑云母衍射数据实际上是大量水黑云母层与少量云母层不规则间层的结果。该水黑云母的d001、d002和d003与规则水黑云母的较大差异并不是仪器测量造成的，而恰恰提供了反映水黑云母中混人蛭石层或云母层的信息，因此在计算变异系数CV时至少不应将d002和d003轻易剔除掉。
Two water biotite samples (Xj-1 and Xj-2) from Yuli, Xinjiang were studied by directional X-ray diffraction. xj-1 contains two minerals, water biotite and vermiculite. xj-2 contains two minerals, water biotite and phlogopite. The d001 of water biotite in the two samples is different, and their diffraction peak shape and the intensity of the shot are different from those of perfectly regular water biotite. According to the graphic method, the results show that the observed data of the biotite mica in xj-1 are actually the result of a large number of irregular layers of water biotite and a small amount of vermiculite, whereas the water observed in xj-2 Biotite diffraction data is actually the result of a large number of water black mica layers and a small amount of mica irregular layers. The large differences between the d001, d002 and d003 of the water biotite and the regular water biotite are not due to instrumental measurements, but rather provide information that reflects the mixed vermiculite or mica layer in the water biotite. Therefore, At least CV002 should not be d002 and d003 easily removed.