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词汇 Cyclic Twin
分类 英语词汇 英语翻译词典
释义

Cyclic Twin

中文百科

孪晶 Crystal twinning

（重定向自Cyclic Twin）
钠长石的孪晶结构示意图
硫化汞的孪晶结构
孪晶接合面在镀锌表面清晰可见
金粗石相的孪晶结构

孪晶是指：由两个或者两个以上同种晶体构成的﹑非平行的规则连生体。又称双晶。在构成孪晶的两个单晶体间﹐必然会有部分的对应晶面﹑对应晶棱相互平行﹐但不可能全部一一平行﹐然而它们必可通过某一反映﹑旋转180°或者反伸（倒反）的对称操作而达到彼此重合或者完全平行。

英语百科

Crystal twinning 孪晶

（重定向自Cyclic Twin）
Diagram of twinned crystals of Albite. On the more perfect cleavage, which is parallel to the basal plane (P), is a system of fine striations, parallel to the second cleavage (M).
Quartz - Japan twin
Twinned pyrite crystal group
Galvanized surface with macroscopic crystalline features. Twin boundaries are visible as striations within each crystallite, most prominently in the bottom-left and top-right.

Crystal twinning occurs when two separate crystals share some of the same crystal lattice points in a symmetrical manner. The result is an intergrowth of two separate crystals in a variety of specific configurations. A twin boundary or composition surface separates the two crystals. Crystallographers classify twinned crystals by a number of twin laws. These twin laws are specific to the crystal system. The type of twinning can be a diagnostic tool in mineral identification.
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