Generally it is very difficult to tackle the problems aroused from differences in crystallinity of clay minerals and preferred orientation in quantitative X-ray diffraction analysis of clay minerals.
粘土矿物X射线衍射定量分析中常遇到的结晶度差异大，择优取向不易消除等困难，目前尚无完善的解决办法。
Seismic velocity anisotropies are mainly caused by lattice preferred orientation( LPO) , shape preferred orientation( SPO) of the major minerals, and oriented microcracks.
影响各向异性的主要因素有岩石的结构构造、矿物的晶格优选方位（LPO）、形态优选方位（SPO）和定向微裂隙。
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