daphyllite

例句：

1. 1. Daphyllite is a type of sedimentary rock that contains quartz and mica.
   石松石是一种含有石英和云母的沉积岩。
2. 2. The daphyllite in the mine is very valuable for its unique mineral composition.
   矿中的石松石因其独特的矿物组成而非常宝贵。
3. 3.The study of daphyllite has led to new insights into the formation of rocks and minerals.
   对石松石的研究为岩石和矿物的形成提供了新的见解。