spinel type

例句：

1. 1. Themineral is a type of spinel thatis commonly found in the earth'scrust.
   这种矿物是一种常见的地壳矿物。
2. 2. Thespinel type has unique properties that makeit useful in various applications.
   尖晶石类型具有独特的性质，使其在各种应用中非常有用。
3. 3. The spinel type wasdiscovered by scientists who were searching for newmaterials with high strength and hardness.
   科学家发现了尖晶石类型，他们正在寻找具有高强度和硬度的新型材料。