Based on the X-Ray diffraction analysis,the preferential orientations of aragonite crystals in nacre and in prismatic layer are systematically studied.

• 结果表明:珍珠层中文石晶体在沿珍珠层面上存在两种定向排列,即(002)和(012),具有择优取向性,柱状晶层结构的无序性比珍珠层大。