positive spinel type

例句：

1. 1. The new material has a positive spinel type structure that makes it highly resistant to wear and tear.
   这种新材料具有正尖晶石型结构，使其非常耐磨损。
2. 2. The research into the positive spinel type of minerals has led to important discoveries in the field of mineralogy.
   对正尖晶石型矿物的研究导致了矿物学领域的重要发现。
3. 3. The positive spinel type of crystals is used in the production of high-quality diamonds.
   正尖晶石型晶体用于生产高质量的钻石。