feldspar in powder

例句：

1. 1.The feldspar in the glass is very clear, which makes the glass very beautiful.
   玻璃中的长石非常透明，这使得玻璃非常美丽。
2. 2. The mineralogist studied the feldspar crystals to understand their structure.
   矿物学家研究长石晶体以了解其结构。
3. 3.The feldspar in the soil helps plants grow by providing them with nutrients.
   土壤中的长石帮助植物生长，为它们提供养分。