double formed crystals

例句：

1. 1. The mineral is composed oftwo different types of crystals.
   这种矿物由两种不同类型的晶体组成。
2. 2. This materialhas a unique double crystalstructure that makes it highly resistantto wear and tear.
   这种材料具有独特的双晶结构，使其非常耐磨损。
3. 3.The double crystal structure of the minerals canbe used to create intricate patterns in jewelry.
   矿物的双晶结构可以用来在珠宝中创造出复杂的图案。