贝壳珍珠层微结构及成因理论

珍珠层是由多边形文石板片和少量有机质（〈５％）组成的具微层理的结构单元,可分为砖型和堆垛型两种类型珍珠层中文石板片晶体的结晶学方向、粒径及形貌等严格受到控制,呈现出高度有序的结构。珍珠层的形成与软体动物的生理活动有关,目前珍珠层的成因理论主要有：与外套的外上皮细胞年龄有关;细胞内结晶细胞外组装说;隔室说;矿物桥说及模板说等。

UTRASTRUCTURE AND FORMATION THEORY OF NACRE SHELLS

Nacre with microlaminate structure is composed of polygonal tablet of aragonite and minor organic matrix (< 5 %). The growing surface of nacre can be diveded into two typesbrick-wall type and stack-up type. In nacre, the crystalline orientation, size and morphology of aragonite tablet are strictly controlled. It is generally accepted that the formation of nacre is closely associated with mollusc metabolism. At present, such theories as"compartment", "mineral bridge" and "template" are used to explain the formation mechanism of nacre.