protomylonite

例句：

1. 1.The gemologist examined the protomylonite and determined its value.
   宝石学家检查了预玉髓石，并确定了其价值。
2. 2. The protomylonite was used in ancient jewelry to enhanceits luster.
   预玉髓石在古代珠宝中被用来增加光泽。
3. 3. Theprotomylonite is a raremineral that has been sought after for itsbeauty and rarity.
   预玉髓石是一种稀有矿物，因其美丽和稀有而备受追捧。