ferro-spinel

例句：

1. 1.The iron spinel is a valuable mineral that is often used in jewelry.
   铁质尖晶石是一种珍贵的矿物，常用于制作珠宝。
2. 2. The iron spinel has been found in many ancient civilizations, suggesting its long history.
   铁质尖晶石在许多古代文明中被发现，这表明它有着悠久的历史。
3. 3. The iron spinel is also known for its unique properties and applications in various fields.
   铁质尖晶石因其独特的性质和在各个领域的应用而闻名。