ptyalith

例句：

1. 1. The ancient city of Machu Picchu is home to a wealth of ptyaliths.
   马丘比丘古城拥有丰富的磷石。
2. 2.The mineralization process in the area has led to the discovery of several rare ptyaliths.
   该地区的矿化过程导致了稀有磷石的发现。
3. 3. The ptyaliths have been used for centuries as ornamental and medicinal purposes.
   磷石自古以来就被用作装饰和药用。