pearl spar

例句：

1. 1. The pearl spar was used to make jewelry in ancient times.
   古代用珍珠石制作珠宝。
2. 2. The pearl spar is a valuable resource for the pearl industry.
   珍珠石是珍珠业的重要资源。
3. 3.The pearl spar is often used as a building material due to its durability and strength.
   由于其耐用性和强度，珍珠石常被用作建筑材料。