ullmannite

例句：

1. 1.The mineral ullmannite is found in the mountains of Switzerland.
   矿物乌尔曼石在瑞士的山区被发现。
2. 2. Ullmannite is a rare mineral that has been used for centuries in traditional medicine.
   乌尔曼石是一种稀有的矿物，几千年来一直用于传统医学。
3. 3. The study of ullmannite has led to new discoveries about the properties of minerals.
   对乌尔曼石的研究已经导致了关于矿物性质的新发现。