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广西防城海水养殖珍珠的内部结构按其珠核外生长层的物质组成及排列方式 ,可划分为珍珠层型、棱柱层型和复合型三种类型 .珍珠层型的珍珠 ,其珍珠层的显微薄层结晶厚度一般 0 3～ 0 5 μm ,矿物结晶以文石为主 ,单晶体呈六方板状或不规则多边形的扁平块状 ,结晶薄层的累积呈规则的韵律环效应 ;棱柱层型的珍珠成分以方解石为主 ,晶体结晶呈放射状或疏状排列 ;复合层型珍珠可细分为纵向复合、横向复合及交替复合等复合类型 .外套膜小片在形成珍珠囊中的变异 ,珍珠囊中夹杂异物以及物理、化学、微生物等外界因素的变化是造成棱柱层型、复合层型珍珠的主要原因 .
The internal structure of Guangxi Fangcheng seawater cultured pearls can be divided into three types: nacre type, prismatic layer type and complex type according to the material composition and arrangement of the growth layer of pearl layer. The thickness of the micro-thin layer is generally 0 3 ~ 0 5 μm. The mineral crystals are mainly aragonite. The single crystal is a flat block with a hexagonal plate shape or an irregular polygon. The accumulation of the crystal thin layer has a regular prosodic ring effect. The prismatic layer The type of pearl is dominated by calcite, and the crystalline crystals are radially or sparsely arranged. The composite pearl can be subdivided into composite types such as longitudinal composite, transverse composite and alternate composite. Inclusion of foreign matter in the capsule and changes in physical, chemical, microbial and other external factors is the main reason for the prism layer type, composite layer pearl.